exists_in_table Yes Returns FALSE if the value does not exist for the column in the given table.

• table_name can be one of
  • a literal value 'tbl_target_table'
  • the name of a constant 'TABLE_TARGET_TABLE'
  • the name of a property, 'Tables::TABLE_TARGET_NAME'
• column_name is the name of the column to be queried

exists_in_table[table_name,column_name]