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6 gru 2016 · 50. Using nullif does the trick: SELECT ifnull (nullif (field1,''),'empty or null') AS field1 FROM tablename; How it works: nullif is returning NULL if field is an empty string, otherwise returns the field itself. This has both the cases covered (the case when field is NULL and the case when it's an empty string).
Definition and Usage. The ISNULL () function returns 1 or 0 depending on whether an expression is NULL. If expression is NULL, this function returns 1. Otherwise, it returns 0. Syntax. ISNULL (expression) Parameter Values. Technical Details. More Examples. Example. Test whether an expression is NULL: SELECT ISNULL (""); Try it Yourself » Example.
Try: NZ (MaritalStatus,"SINGLE") From Nz Function in the documentation: You can use the Nz function to return zero, a zero-length string (" "), or another specified value when a Variant is Null.
The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field: Example Get your own SQL Server. SELECT CustomerName, ContactName, Address. FROM Customers. WHERE Address IS NULL; Try it Yourself » Tip: Always use IS NULL to look for NULL values.
25 kwi 2021 · The MySQL ISNULL() function is used to check for any NULL values in the expression passed to it as a parameter. If the expression has/results to NULL, it displays 1. If the expression does not have or result in NULL, the function returns 0. The MySQL IFNULL() function is used to return a specified value if the expression is NULL.
6 cze 2024 · The ISNULL function in MS SQL takes two arguments: the first is a value or column name, and the second is the default value if the first argument is null. This query retrieves rows where the code column is either null, an empty string, or contains only spaces. In MySQL, ISNULL(code) returns 1 if the column code is NULL. Otherwise, it’s 0:
MySQL IFNULL function is one of the MySQL control flow functions that accepts two arguments and returns the first argument if it is not NULL. Otherwise, the IFNULL function returns the second argument. The two arguments can be literal values or expressions.
