E. ArrivalDate, Trips. Now I see two ways to achieve this: The MONTHS_BETWEEN () function is used to get the number of months between dates (date1, date2). This conversion uses the NLS_DATE_FORMAT parameter to decide the format of the output string. T was trying do calculate age as on todays date in ORACLE but after a lot of brain storming i didn't get it. Concatenates a date to a time on either side of the + symbol and returns a TIMESTAMP or TIMESTAMPTZ. Returns a date string or the current date. StartDate,. Expressions can contain only one hint. Please refer the below examples and kindly let me know your ideas. lastModified - w. This formula subtracts the first day of the ending month (5/1/2016) from the original end date in cell E17 (5/6/2016). Tip. I want to calculate the current Age from Date of Birth in my Oracle function. As per the methodology used in this date calculator, a week starts on 'Monday' and ends on 'Sunday'. StartDate, SYSDATE) you would use: MONTHS_BETWEEN(pr. If you want an integer number of days. The easiest is the connect by level method: Copy code snippet. )CREATE OR REPLACE FUNCTION datediff (p_what IN VARCHAR2, p_d1 IN DATE, p_d2 IN DATE) RETURN NUMBER /* Updated to reflect current database and PL/SQL functionality */ AS BEGIN RETURN (p_d2 - p_d1) * CASE UPPER (p_what) WHEN 'SS' THEN 24 * 60 * 60 WHEN 'MI' THEN 24 * 60 WHEN 'HH' THEN 24 ELSE NULL END; END;If this solve your problem, here's the sql server syntax, just replace the variable @yourDate with your column name. For formatting functions, refer to Section 9. Also, you can check this for minutes : Oracle : how to subtract two dates and get minutes of the result. (Oct 2006 - June 2005 = 16) DP_WEEK returns the distance between the weeks capturing the input dates. If i change the month in the first date to Feb (02) I get something strange. In the SELECT list, you want to return a character string that represents the date in your preferred format. A) Get the difference in months of dates on the same day. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the. If you are familiar with Microsoft SQL Server functions but are new to Oracle databases, see Character Functions to compare SQL functions support in Microsoft SQL. 65. 01/31/2021: Introduced in SQL Server 2012. I tried this selectThat said, you can use the following to determine if the date falls on a weekend: SELECT DATENAME (dw,GETDATE ()) -- Friday SELECT DATEPART (dw,GETDATE ()) -- 6. Then the 1 represents the first day of that month. Possible values: text representing an entry in the IANA time zone database. here i am trying get the month differences between two. If I run. I would recommend. Another example using the MONTHS_BETWEEN function in Oracle/PLSQL is: MONTHS_BETWEEN (TO_DATE ('2003/07/01', 'yyyy/mm/dd'), TO_DATE ('2003/03/14', 'yyyy/mm/dd') ) would return 3. Conversion among time units is also allowed; you can add, subtract, or compare dates by using days and state. Arguments. 1. current_time() returns the date and time on the database client side. How best can this be written? I need to use this in a where clause on DI Studio. Month and day of the year don’t appear to be factored into the equation. datediff (q,start date,end date) i. The DATEPART() function returns an integer which is a part of a date such as a day, month, and year. (year/month/date from date) //oracle function for extracting values from date. public static int MonthDiff (DateTime d1, DateTime d2) { int retVal = 0; // Calculate the number of years represented and multiply by 12 // Substract the month number from the total // Substract the difference of the second month and 12 from the total retVal. This function is not sensitive to the NLS_CALENDAR session parameter. It helps me a lot . Syntax. What this allows you to do is pass in two TIMESTAMP or DATETIME values (or even DATE as MySQL will auto-convert) as well as the unit of time you want to base your difference on. The system always returns a positive number regardless of. The function INTCK ('MONTH','1feb1991'd,'31jan1991'd) returns –1 because the first date is in a later discrete interval than the second date. select (CURRENT_DATE - item_expired) as remaining_time from customers; While this will provide you with the remaining time,. Snowflake doesn't offer a function that does that. If you need to calculate minutes or seconds, you simply multiply the result by a constant: (date2 - date1)*1440 -- number of minutes (date2 - date1)*86400 -- number of seconds. The dateadd function adds or subtracts a number of specified time units from a given date. 1,984 1 1 gold badge 17 17 silver badges 31 31 bronze badges. SQL> ed Wrote file afiedt. subtract and give the difference in number of. Date, DateTime, and Time Out Wrappers for SQL and Dynamic Views. event_id, evnt. 8494441'. Subtracting two dates will return if and only if they are the same year, the same month, the same day, the same hour, the same minute, and the same second. From the inputs you got there are 123 months between the date of 07/03/2011 to 24/3/2021. SELECT DATEDIFF (YY, DateOfBirth, GETDATE ()) - CASE WHEN RIGHT (CONVERT (VARCHAR (6), GETDATE (), 12), 4) >= RIGHT (CONVERT (VARCHAR (6), DateOfBirth, 12), 4) THEN 0 ELSE 1 END AS AGE. then the following should be the result. g. The datediff function returns the difference between two specified dates in the time units that you specify: years, quarters, months, weeks, days, hours, minutes, or seconds. Another solution by using Cross Apply:. StartDate) AND. This is from my own library, will return the difference of months between two dates. SELECT DATEDIFF (month,'2011-03-07' , '2021-06-24'); In this above example, you can find the number of months between the date of starting and ending. Using the standard EMP and DEPT tables, for example. Examples of Results in Months. MySQLには MONTH 機能がありますが、Oracleにはありません。 存在しない関数 DATEDIFF が無効なIDであるのと 同じ理由。 ORA-00904の解決策は、 EXTRACTという名前の正しいOracle関数 を呼び出して、列の月の値を取得することです。Use DATEADD and DATEDIFF() function together in SQL query. The screenshot below shows the data I want as well as the incorrect month between results I am obtaining. SELECT DATEADD (month, 1, '20220730'); The below DATEADD will add 1 year to the provided date value, the year changed from 2022 to 2023. The result is formatted according to the Format parameter. The Overflow Blog An intuitive introduction to text embeddings. So if the week number was Week 1 of 2015, the calculation would return "2015-01. ) and rest are two dates which you want to compare. Adds days, months, and years to the date and returns the result. StandardDeviationSample(group. 1. If date1 is later than date2 , then the result is positive. select datediff (q,'03-30-2005','04-01-2005') will return 1. g. ) and rest are two dates which you want to compare. My DOB- 02-feb-1984 so my age should get as 27 Years 2 months 8 days How to do it. 1. Then use these rules to set the column values: Start date: for the first row, return the input date; otherwise return the first of the month; End date: get the month start for the next row and subtract one day from it. Discussion: To calculate the difference between the timestamps in Oracle, simply subtract the start timestamp from the end timestamp (here: arrival - departure ). ;-). The math is 100% accurate for dates within a couple of hundred years or so. {"payload":{"allShortcutsEnabled":false,"fileTree":{"inst/csv":{"items":[{"name":"jarChecksum. Just divide the total by 7 to get the weeks and then calculate the remaining days. DATEDIFF (day/month/year, <start_date>, <end_date>);AT TIME ZONE. 3. Twinkles Twinkles. @KanagaveluSugumar - An Oracle DATE always has a year, month, day, hour, minute, and second component. However, i think for Oracle (not sure of the latest versions) there is no DATEDIFF(), but rather Oracle allows you to simply subtract one date from another. I want to select some data from one table if a date from another table is at least 6 months before today. Use DATEADD and DATEDIFF() function together in SQL query. 取得一季中的第一天:. DATEDIFF(datepart, startdate, enddate) Parameters. DATEPART function is used to return a part of a given date in a numeric value. They both do very different things. Oracle DATEDIFF函数在Oracle中的使用 在本文中,我们将介绍Oracle数据库中的DATEDIFF函数。 阅读更多:Oracle 教程 什么是DATEDIFF函数? DATEDIFF函数用于计算两个日期之间的时间间隔。它可以在Oracle数据库中使用,并返回一个整数值,表示两个日期之间的差异。这对于计算两个日期之间的天数、小时数、分钟. Must be a date, a time, a timestamp, or an expression that can be evaluated to a date, a time, or a timestamp. DATE_ADD () Add time values (intervals) to a date value. From the documentation: date_part (): The date_part function is modeled on the traditional Ingres equivalent to the SQL-standard function extract:Date/time functions. two-digit days. For DATEDIFF: date_or_time_expr1 and date_or_time_expr2 can be a date, time, or timestamp. You can't transform this value to date by to_date function. Specifically, it gets the difference between 2 dates with the results returned in date units specified as years, months days, minutes, seconds as a bigint value. Its seems that "DATEADD ": invalid identifier. you can check against last 90 days. g. Currently I am only returning 1. select trunc ( (sysdate - to_date ('2012-02-28 15:20', 'YYYY-MM-DD hh24:mi')) / 24) from dual; You should have multiplied by. 58064516129032. Using datediff in oracle. ). Also, "month" is an arbitrary concept when applied to a certain number of days in an interval. Based on the spreadsheet above, the following Excel function would return the following values:In Oracle, the datetime system function is SYSDATE. For example, we can use the DATEPART function to get the day of a given date to determine whether an order was placed on Sunday or not. Then, we need a 2-digit month string. datediff() is not giving tHe result as I am working in Oracle. The days are in two different, adjacent months, so the answer is 1 month difference. The month and the last day of the month are defined by the parameter. However, The problem is different number of records because DATEDIFF(month,a,b)<=4 in SQL Server returns only the month difference whereas months_between(a,b)<=4 in oracle returns the. Taking example 1, Oracle is telling me that 3rd Feb was a longer time ago than Informatica is telling me it is. CREATE FUNCTION trunc_date (@date DATETIME) RETURNS DATETIME AS BEGIN SELECT CONVERT (varchar, @date,112) END. date. Oracle PeopleSoft Tips and Tricks. This is because the two dates are exactly 24 hours apart. CASE WHEN a. 2. Returns 'Oracle Database 10g Enterprise Edition Release 10. Dateadd function is not working in oracle SQL. Try SELECT SYSTIMESTAMP + INTERVAL '5' MINUTE, SYSTIMESTAMP + 5 / 24 / 60 to convince yourself. So, Feb-28 to Mar-28 is a month. Date manipulation is a common scenario when retrieving or storing data in a Microsoft SQL Server database. DATEDIFF does not guarantee that the full number of the specified time units passed between 2 datetime values: -- Get difference in hours between 8:55 and 11:00 SELECT DATEDIFF (hh, '08:55', '11:00'); -- Returns 3 although only 2 hours and 5 minutes passed between times -- Get difference in months between Sep 30, 2011 and Nov 02, 2011. e. In SQL, we can add or subtract days, months, or years to a date by using the DATEADD function. date + time. FromDate, r. - Find the “date_diff” in hours and multiply it by “60”. Functions that return the current date or time each are evaluated only once per query at the start of query execution. Interprets an INT64 expression as the number of days since 1970-01-01. Can be one of the following values:Step-7: SQL Query to Calculate the Number of Months between two specific dates : Now let’s find the number of months between the dates of an order of ‘Maserati’ and ‘Ferrari’ in the table using the DATEDIFF () function. Modified 1 year, 8 months ago. Multiply by 24 -- hours, multiply by 60 minutes, multiply by 60 -- seconds. DECLARE @date datetime2 = '2021-01-07 14:36:17. StartTime: 2022-27-27 14:00:00 EndTime:2022-12-12 19:30:00 Firstly, to find the time difference, we will use. The functions in this section use a format string that is compatible with JodaTime’s DateTimeFormat pattern format. The datediff function can return the difference between two dates in days, months, years, minutes, etc. SELECT SYSDATE AS "Date" FROM DUAL; SYSDATE returns the system date and time but does not display the time unless formatted to do so with the function TO_CHAR (): SELECT TO_CHAR (SYSDATE,. The date argument is a DATE value (or an expression that resolves to a DATE value) that should be rounded. To find the date difference in minutes from the given DateTime values, use the following steps: - First, find the “date_diff” in days and multiply it with “24”. (Oct 2006 - June 2005 = 16) DP_WEEK returns the distance between the weeks capturing the input dates. I've tried Datediff(day, start_date, end_date), but I was prompt with: invalid column name. Currently, my code just returns zero on the right side of the decimal place. It operates according to the rules of the Gregorian calendar. Oracle Month to Date:Showing data 6 months greater than date parameter?? 607634 Mar 24 2010 — edited Mar 24 2010. Date 1: 10th March 2011. Dateadd(month,-3,getdate()) And end date will be getdate() Ex: If todays date is 10-March-2016 then the start date will be 10-Dec-2015 and date will be 10-March-2016. I have tried it before. This means that multiple references to a function. Thanks for the infoFirst step is to join the tables together such that we get a row for every relevant month that intersects with the start and end dates in your HRAL table. DATEADD (mm, 1, @Date) and subtract 1 day from it to get the last day of current month. Expressions must contain a complete hint. For example, you could use the DATEDIFF function in VBA code and create the following function: Function TestDates (pDate1 as Date, pDate2 as Date) as Long TestDates = DateDiff ("d", pDate1, pDate2) End Function. Get Number of Months Between 2 Dates. @Mohit224 - If you are saying that you want to ignore any fractional part of a year, then you. Would give you rows where date2 (the later date) is 60 to 90 days later than date1. sql-server. Must be one of the values listed in Supported Date and Time Parts (e. Follow edited Apr 7, 2020 at. Return the current time. The weekday (dw) datepart returns a number that. PeopleTools uses the SQL directly from the view definition (view text) and doesn't generate anything, so no meta-SQL wrapping is done. January 1 of any year defines the starting number for the week datepart, for example: DATEPART (wk, 'Jan 1, xxxx') = 1, where xxxx is any year. This question was incorrectly asked. Syntax. It works according to the Gregorian Calendar. End date will be sysdate. A number representing the input date between January 1, 1970 and Dec 31, 2037. e it takes the quarter in which the start date exists and subtracts it from the quarter in which the end date exists. date_or_time_expr1, date_or_time_expr2. dividing by 365. Purpose MONTHS_BETWEEN returns number of months between dates date1 and date2. Two dates to calculate the number of days between. I guess I did not read the question in depth. Tdy. 3. Syntax. Viewed 110k times 49 I have a table with following structure. By adding 1 month, I am calculating the first day of next month and then subtraction 3 milliseconds, which allows me to arrive at the last day of the current month. If you want to format it as you wanted (note that mm format mask is for months; mi is for minutes), then you could do some extracting - again from timestamp (won't work for date):. PRINT DATEDIFF(Day, 2010-02-20, 2010-01-01) RETURN 20SELECT DATEDIFF (MM,0,GETDATE ()) Add same number of month to date 0 (1901/01/01) SELECT DATEADD (MM, DATEDIFF (MM,0,GETDATE ()),0) Then we will get first day of current month (Current Date or a given date) To get Last Day of Last Month. It takes into account the fact that DATEDIFF() computes the difference without considering what month or day it is (so the month diff between 8/31 and 9/1 is 1 month) and handles that with a case statement that decrements the result. Kindly tell me how to calculate age as in years month days. For a baby born 28-Feb-17, properly calculated they turn 1 years old on 28-Feb-18 - their next birthday. INTERVAL '15. this will gives you the last 3 month date (from 1st of the month) WHERE date_column >= DATEADD (MONTH, DATEDIFF (MONTH, 0, GETDATE ()) - 3, 0) you have 3 date. The desired output is: CustName Year OrderDate AA 2000 01-JAN-2000 AA 2000 05-FEB-2000 AA 2000 10-MAR-2000 AA 2007 05-MAY-2007 AA 2007 07-JUN-2007 AA 2007 06-JUL-2007. The following illustrates the syntax of the DATEPART. two full prior months plus the current partial month. Table 9. For example, between those dates: "03/03/2020 - 06/06/2020" I need something like "(03,04,05,06)". TZD is a time zone designator ( Z, + / - hh: mm or + / - hhmm ). It is the unit in which the DATEDIFF() function returns the difference between a start date and an end date e. 2425. So I am porting many SQL Procedures to Oracle. (Oct 10, 2006 - June 14, 2005 = 69) SELECT months_between ( date_1, date_2 )/12 years_between FROM employee. ToDate)); My SQL to LINQ Recipe might help you with some translation issues in the future. 99. date_to) * 2) - CASE WHEN DATEPART(DW, evnt. Last 3 Months. The datepart value cannot be specified in a variable, nor as a quoted string like 'month'. Justin, the example which you gave, if that is the scenario I want the output as 1. DateValue > DateAdd (day,-3,getdate ()) doing this in this way makes your. create table test_table ( customer_num NUMBER, card_number char(2), card_issue_date DATE, card_expire_date DATE ). DATEDIFF is built to return the number of date BOUNDARIES that are crossed. Consider SQL Server function to calculate the difference between 2 dates in months: SQL Server : -- Difference between Oct 02, 2011 and Jan 01, 2012 in months SELECT DATEDIFF ( month, '2011-10-02', '2012-01-01') ; -- Result: 3. If you omit it, the ROUND () function. SELECT case when DATEDIFF(month, '2005-12-31' , '2006-04-01 ') > 3 then 'yes' else 'no' end Hope that helps, John. join our newsletter and get access to exclusive content every month. 9. If date1. 3 Answers. 3. DECLARE @date datetime2 = '2021-01-07 14:36:17. date_open are both of type date, you can simply subtract them to get a difference in days. It means that the DATEPART function returns the number of times the boundary between two units is crossed. Unfortunately, Oracle SQL doesn't allow the DATEDIFF function. SQL Querying by a specific month. Goal. %DateAdd . Date2Date. For example, suppose you have values below the start and end times. 指定した日付の差異。次の値が有効です。 DD: 差異を日数で計算します。. Also the order of the parameters is swapped. January 30, 2004 - 7:26 pm UTC. Fractions are allowed; you can add 2. In SQL Server, there is a function datediff with datepart 'q'/quarter which behaves as follows :--. This is in the manual. If date1 is earlier than date2 , then the result is negative. columns. DP_MONTH returns the distance between the months capturing the input dates. 'month' or month). PRINT DATEDIFF(Day, 2010-01-20, 2010-01-01) RETURN 19 Which is correct. If you subtract from one date other you will get a count of days between this two dates. The difference between two dates (in oracle's usual database product) is in days (which can have fractional parts). For both ADD_MONTHS and DATEADD, if the result month has fewer days than the original day, the result day of the month is the last day of the result month. DATE_ADD. Run SQL ». parse_datetime(string, format) → timestamp with time zone. It counts the number of year boundaries between two dates. Oracle offers its own solution, although does not have the DATEDIFF function. Parameter Description; date1, date2: Required. 2. The integer value represents the day and the fractional value represents the. 2188940092. Select name,surname,datediff(YY,birthDate,getdate()) as age from students order by age. Converting a raw number of days into a number of weeks and days is pretty simple. where (year(getdate())-year(birthDate)) = 17. DateDiff ( date1, date2, date_part) パラメータ 説明; date1. 7 months ago. i need to find the difference of two dates as the number of months: find the last day of the month of both the dates. ReturnDate) AS nvarchar(max)) END) AS [Duration] As a side note: I used nvarchar(max) for consistency with the first part of your query. select *, cast ( (cast (begin_date as date) - cast (end_date as date) YEAR) as decimal (3,2)) AS year_diff from x. Syntax¶ MONTHS. datediff isn't a function in Oracle. DateDiff(“m”, Fields! starting date. CancelDate IS NOT NULL THEN (CONVERT(NVARCHAR(MAX), DATEDIFF(day, Trips. 1. NEW_TIME returns the date and time in time zone timezone2 when date and time in time zone timezone1 are date. As GMB has mentioned in the comment above, date functions depend on the database type you are using. 7 Reference Manual :: 12. Java date functions. This works because you have no issue with months and years or one-digit vs. For example the difference between 1st March 2011 and 3rd March 2012 is 1. Start learning SQL now ». DATEDIFF is wrong. Because the months are 06 in both dates. From the inputs you got there are 123 months between the date of 07/03/2011 to 24/3/2021. (date1 - date2)The TRUNC (date) function returns date with the time portion of the day truncated to the unit specified by the format model fmt. For example, only one set of /*+ */ is allowed. SELECT {sales} ON COLUMNS, Filter( [Time dimension]. S is milliseconds in one or up. 1. If within the same year, you can use Date. SYSDATE) and subtracting a date from a timestamp (e. current_timestamp() returns the timestamp on the database client side. Apr 5, 2021 at 15:55. Syntax:. I am trying to create a new column that will show the age of the person on the date that they took up the membership. The SQL code is "where fac. It is a function of SQL server. The second method uses an extract function to obtain the years, months, and days separately. Usage Notes¶. 25 = 0. This can have results that you are not expecting. Asked 2 years, 9 months ago. Here is the synopsis: If using Oracle use the trunc and numtoyminterval functions; if using SQL Server use the datediff function. date_to, DATEDIFF(DD, evnt. Improve this answer. ReturnDate)) + ' days') ELSE CAST(DATEDIFF(day, Trips. TIMESTAMP or TIMESTAMPZ. ROUND returns date rounded to the unit specified by the format model fmt. Again, the expected results would be a value of 1. SELECT * FROM FB as A WHERE A. If you are comparing to a date column in a existing table, then you need the date part too as you want to know December of which year was the previous month. You also wouldn't prefix a function name with the @ sign. Here is example with 23 hours difference: select CONVERT (VARCHAR, DATEDIFF (dd, '2018-04-12 15:54:32', '2018-04-13 14:54:32')) + ' Days ' + CONVERT (VARCHAR, DATEDIFF (hh, '2018-04-12 15:54:32', '2018-04-13 14:54:32') % 24) + ' Hours ' But the. Would give you rows where date2 (the later date) is 60 to 90 days later than date1. One option that avoids needing to add EndDate + 23:59:59. Modified 1 year, 3 months ago. Syntax. This is so as for the ease of use later for php. DATEDIFF() Returns the difference between the two dates. I have a table where PurchasedDate is maintained. It counts the number of year boundaries between two dates. 2 Answers Sorted by: 0 The best thing to do in this case is to use Oracle's MONTHS_BETWEEN () function. Oracle 9i and later versions support CURRENT_DATE and CURRENT_TIMESTAMP. declare @EmployeeStartDate datetime='01-Sep-2013' declare @EmployeeEndDate datetime='15-Nov-2013' select DateDiff (mm,@EmployeeStartDate, DateAdd (mm, 1,@EmployeeEndDate)) If. (year/month/date from date) //oracle function for extracting values from date. Should I change (edit) the title or delete and re-post the question properly? This is what I'm addressing. In certain cases, such as string-based comparisons or when a result depends on a different timestamp format than is set in the session parameters, we recommend explicitly converting. It should have been DATEDIFF NOT DATEADD with respect to the WEEK parameter. It should have been DATEDIFF NOT DATEADD with respect to the WEEK parameter. this will give you the first of the month for a given date. NEXT_MONTH: Returns the first day of the next month after the specified date. DATEDIFF(month, 0, GETDATE()) will give you the number of months from 1900-01-01 until now. Functions are based on a date-time serial number that equals the number of days since December 30, 1899. 0208 days. One truncates a date to the precision specified (kind of like rounding, in a way) and the other just returns a particular part of a datetime. DATEDIFF Examples Using All Options. i. it returns the difference in days if datepart is day. #. ( See. Share. (You can also subtract fractions of days, but that might be outside the scope of this answer. AgeInYears value of 0 while in the other case the AgeInYears value is 1. We are in the process of migrating to a PostgreSQL SDE and with the same feature class the query no. DATEDIFF(interval, date1, date2) Parameter Values. Thus far, we have seen very important SQL date format functions such as DATEPART, DATENAME, YEAR, MONTH, and DAY, with particular emphasis on the DATEADD SQL function and the DATEDIFF SQL function. Transact-SQL. Enter a date format string that describes the Date2 parameter. DATEADD (date part, units, date or datetime) Return date math results: datetime DATEDIFF (date part, start date, end date) Give the difference between 2 dates in units specified by. For example, this function returns 1. 首先在oracle中没有datediff ()函数. StandardDeviationPopulation(group. g. Note that SQL Server DATEDIFF(month, date2, date1) function does not return exactly the same result, and you have to use an user-defined function if you need to fully emulate the Oracle MONTHS_BETWEEN function (see. Hot. How To turn a string with "pipe-separated" values into individual rows in Oracle PL/SQL. The former produces a number representing the count of days between the two dates, while the latter produces an interval representation of the. then just use it in the script eg. 0. DATEDIFF(datepart, startdate, enddate) Where datepart is a string that specifies the unit of time you want to use for the calculation (e. The syntax for these extended functions is. The DATEDIFF function does not calculate the difference in months based on days. Example: DATEADD(MONTH, 1, DATE '2001-01-31') DATEDIFF { DATEDIFF |. date_open END. subtract and give the difference in number of months. g for me the max dates is 1399, You can calculate this with select count(*) from sys.