delete all records from table
DELETE FROM table_name;
sql delete all values in a column
UPDATE TableName SET ColumnName = NULL
sql delete where in
-- Deletes all records where `columnName` matches the values in brackets.
DELETE FROM tableName WHERE columnName IN ('val1', 'val2', 'val3');
drop all data from tables
DELETE FROM my_table; -- all rows, needs a COMMIT to validate
TUNCATE TABLE my_table; -- all rows, quicker, no possible roolback
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