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6 gru 2016 · 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).
17 lis 2009 · Select column, if blank select from another. How does one detect whether a field is blank (not null) and then select another field if it is? What I really need is a IsBlank function that works the same as IsNull but with with blanks. REPLACE doesn't work with blanks, COALESCE only works with NULLS.
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
Definition and Usage. The IF () function returns a value if a condition is TRUE, or another value if a condition is FALSE. Syntax. IF (condition, value_if_true, value_if_false) Parameter Values. Technical Details. Works in: From MySQL 4.0. More Examples. Example. Return 5 if the condition is TRUE, or 10 if the condition is FALSE:
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.
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.
26 cze 2020 · To check whether a field is null or empty in MySQL, use the IF() function in MySQL. The syntax is as follows − SELECT IF(yourColumnName IS NULL or yourColumnName = '', 'NULLId', yourColumnName) as anyVariableName from yourTableName;
