mysql delete from table where name not in another table code example

Example 1: mysql delete if not in another table

DELETE FROM BLOB 
 WHERE NOT EXISTS(SELECT NULL
                    FROM FILES f
                   WHERE f.id = fileid)

Example 2: mysql delete if not in another table

DELETE b FROM BLOB b 
  LEFT JOIN FILES f ON f.id = b.fileid 
      WHERE f.id IS NULL

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Sql Example

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