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18 mar 2014 · We can use CASE for setting blank value to some char or String. I am using NA as Default string. SELECT phone, CASE WHEN phone2 = '' THEN 'NA' END AS phone2 ELSE ISNULL(phone2,0) FROM jewishyellow.users WHERE phone LIKE '813%'
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
This tutorial shows you how to use MySQL WHERE clause to filter rows based on specified conditions.
I tried the following: SELECT column_name. FROM information_schema.columns. WHERE table_name = "table_name". AND EXISTS (. SELECT DISTINCT column_name FROM table_name WHERE column_name IS NOT NULL. ) But this also returns the column names where all the entries are NULL.
WHERE Syntax. SELECT column1, column2, ... FROM table_name. WHERE condition; Note: The WHERE clause is not only used in. SELECT statements, it is also used in UPDATE, DELETE, etc.!
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.
21 cze 2024 · The WHERE clause is used to specify a condition while fetching data from a single table or by joining multiple tables. Only the records that meet the specified condition are retrieved. Syntax: SELECT column1, column2, ... FROM table_name.
