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  1. stackoverflow.com › questions › 2177543MySQL - Using If Then Else in MySQL UPDATE or SELECT Queries

    1 lut 2010 · How do I update a table and set different values upon the condition evaluating to True. For instance : UPDATE Table SET A = '1' IF A > 0 AND A < 1 SET A = '2' IF A > 1 AND A < 2 WHERE A IS NOT NULL;

  2. dba.stackexchange.com › questions › 36747IF NOT NULL then UPDATE else keep the value of the field

    The Update works if I update all fields with the query shown in the top. However when I Leave a textbox empty, then I get an error that the @parameter is missing a value. So trying to find a solution to update only the field where is something written.

  3. dba.stackexchange.com › questions › 66498IF IS NULL then SINGLE else keep the value of the field

    You can use the Nz function to return zero, a zero-length string (" "), or another specified value when a Variant is Null. For example, you can use this function to convert a Null value to another value and prevent it from propagating through an expression.

  4. dba.stackexchange.com › update-a-column-if-the-update-querys-value-is-not-emptymysql - Update a column if the update query's value is not empty...

    4 sie 2021 · If this value is not NULL but some predefined literal (for example, empty string '') then use SET column = COALESCE(NULLIF(?, ''), column). Additional NULLIF converts this predefined value to NULL (and not changed any other value) then the expression acts like described above.

  5. www.geeksforgeeks.org › how-to-update-null-values-in-a-field-in-mysqlHow to Update NULL Values in a Field in MySQL - GeeksforGeeks

    17 maj 2024 · Syntax: Updating a column with a NULL value in MySQL is surprisingly straightforward. Check out this basic syntax: UPDATE table_name. SET column_name= 'N/A'. WHERE condition; table_name: The name of your table. column_name: The column you want to turn into NULL. condition: When you want to be selective.

  6. community.spiceworks.com › t › isempty-function-in-accessIsEmpty Function in Access - Databases - Spiceworks Community

    11 mar 2013 · I have two linked tables in an Access DB, and I’m trying to write a function that says: If X is blank, take value from Y, otherwise take value from X. I’ve used IIF functions in Access before, but for some reason this one isn’t working.

  7. stackoverflow.com › questions › 8470813How do I check if a column is empty or null in MySQL?

    29 lis 2019 · If you simply want to check if a column is null or empty, you may be better off doing this: SELECT myCol FROM MyTable WHERE MyCol IS NULL OR MyCol = '' See TRIM COALESCE and IS NULL for more info. Also Working with null values from the MySQL docs

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