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Data Science Explorer
[Basic Grammar] SQL NULL Values
NULL value is a field of no value. Test for NULL Values IS NULL Syntax SELECT column_names FROM table_name WHERE column_name IS NULL; IS NOT NULL Syntax SELECT column_names FROM table_name WHERE column_name IS NOT NULL; IS NULL Operator The NULL operator is used to test for empty values which is NULL Values. Example Write SQL lists all guests with a NULL values in the "City" field: SELECT Countr..
SQL
2023. 10. 14. 11:20