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  1. MariaDB Server
  2. MDEV-6341

INSERT ... SELECT UNION with parenthesis

        Details

        • Type: Bug
        • Status: Open
        • Priority: Minor
        • Resolution: Unresolved
        • Affects Version/s: 5.5.38, 10.0.12
        • Fix Version/s: 10.0, 5.5
        • Component/s: None
        • Labels:
          None

          Description

          I never noticed this or never thought it is a problem, but please look at this post:
          http://blog.mclaughlinsoftware.com/2014/06/15/mysql-insert-from-query/

          The "problem" is that parenthesis are allowed for INSERT (SELECT), but not for INSERT (SELECT UNION), and someone can conclude that INSERT SELECT UNION is not supported:

          MariaDB [test]> INSERT INTO t3 (SELECT a, NULL AS b FROM t2);
Query OK, 3 rows affected (0.08 sec)
Records: 3  Duplicates: 0  Warnings: 0
MariaDB [test]> INSERT INTO t3 (SELECT a, NULL AS b FROM t1 UNION SELECT * FROM t2);
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'UNION SELECT * FROM t2)' at line 1
MariaDB [test]> INSERT INTO t3 SELECT a, NULL AS b FROM t1 UNION SELECT * FROM t2;
Query OK, 6 rows affected (0.08 sec)
Records: 6  Duplicates: 0  Warnings: 0

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                rspadim roberto spadim added a comment -

                considering: https://mariadb.com/kb/en/insert-select/

                MariaDB [test]> INSERT INTO t3 (SELECT a, NULL AS b FROM t2);
                this should not work

                MariaDB [test]> INSERT INTO t3 (SELECT a, NULL AS b FROM t1 UNION SELECT * FROM t2);
                this should not work

                MariaDB [test]> INSERT INTO t3 SELECT a, NULL AS b FROM t1 UNION SELECT * FROM t2;
                this should work

                Show
                rspadim roberto spadim added a comment - considering: https://mariadb.com/kb/en/insert-select/ MariaDB [test] > INSERT INTO t3 (SELECT a, NULL AS b FROM t2); this should not work MariaDB [test] > INSERT INTO t3 (SELECT a, NULL AS b FROM t1 UNION SELECT * FROM t2); this should not work MariaDB [test] > INSERT INTO t3 SELECT a, NULL AS b FROM t1 UNION SELECT * FROM t2; this should work

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                  • Assignee:
                    Unassigned
                    Reporter:
                    f_razzoli Federico Razzoli
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                    Dates

                    • Created:
                      Updated: