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25 lut 2016 · The following query is not returning values for CurrentVisitor in my ms access 2010 database: SELECT ClientNumber, MAX(LastVisitDate) AS LastVisitStart. FROM VisitsTable. GROUP BY ClientNumber) AS t. I think the reason is that the check for null in the If() operation is not written correctly.
11 lut 2020 · In SQL Server we can use IsNull() function to check whether expression value is null or not. For ex. Select IsNull(sum(amount),0) as TotalAmount From Payments
Definition and Usage. The NULLIF () function returns NULL if two expressions are equal, otherwise it returns the first expression. Syntax. NULLIF (expr1, expr2) Parameter Values. Technical Details. More Examples. Example. Compare two expressions: SELECT NULLIF('Hello', 'Hello'); Try it Yourself » Example. Compare two expressions:
NULLIF is equivalent to a searched CASE expression in which the two expressions are equal and the resulting expression is NULL. We recommend that you not use time-dependent functions, such as RAND(), within a NULLIF function.
10 cze 2023 · The syntax of the SQL NULLIF function is: NULLIF (expr1, expr2) The parameters of the NULLIF function are: expr1 (mandatory): This is the first value to use for the comparison. It is also returned if the values do not match. expr2 (mandatory): This is the second value to use for the comparison.
This tutorial introduces you to the SQL NULLIF function and shows you how to add the if-else condition to your SQL queries.
SQL Server NULLIF expression overview. The NULLIF expression accepts two arguments and returns NULL if two arguments are equal. Otherwise, it returns the first expression. The following shows the syntax of the NULLIF expression: NULLIF(expression1, expression2) Code language: SQL (Structured Query Language) (sql)
