Search results
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
18 mar 2014 · WHERE t.phone LIKE '813%'. AND t.phone2 > ''. Notice the > '' part, which will check if the value is not null, and if the value isn't just whitespace or blank. Basically, if the field has something in it other than whitespace or NULL, it is true.
6 cze 2024 · We can use the function NULLIF to compare and check if the column contains null or empty values: SELECT id, name FROM Department WHERE NULLIF(TRIM(code), '') IS NULL; The NULLIF function evaluates its two arguments, returning NULL if they are equal.
2 lut 2024 · To determine if a column is empty or null in MySQL, we utilize the IS NULL and IS NOT NULL conditions in a SELECT statement. To ascertain if a column is empty or null in SQL, use COALESCE (column, ”) or column IS NULL OR column = ”.
13 kwi 2016 · MySQL Query: Delete from 'table2' where column = 'value' IF column in 'table1' = 'value'
When reading data with LOAD DATA, empty or missing columns are updated with ''. To load a NULL value into a column, use \N in the data file. The literal word NULL may also be used under some circumstances.
Summary: in this tutorial, you will learn how to use the MySQL WHERE clause in the SELECT statement to filter rows from the result set. Introduction to MySQL WHERE clause. The WHERE clause allows you to specify a search condition for the rows returned by a query. The following shows the syntax of the WHERE clause:
