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  1. MariaDB Server
  2. MDEV-10028

Syntax error on ((SELECT ...) UNION (SELECT ...))

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Duplicate
    • 5.5, 10.0, 10.1, 10.2
    • 10.4.0
    • Parser

    Description

      I create and populate a table:

      DROP TABLE t1;
      		 
      CREATE TABLE t1 (a INT);
      		 
      INSERT INTO t1 VALUES (10);
      		 
      INSERT INTO t1 VALUES (20);
      		 
      INSERT INTO t1 VALUES (30);

      Now I run this SQL Standard compliant query:

      ((SELECT a FROM t1) UNION (SELECT a FROM t1));

      it returns a syntax error:

      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 a FROM t1))' at line 1

      PostgreSQL and Oracle work fine on the same query.

      This Standard-compliant query also returns a syntax_error:

      (SELECT * FROM t1 UNION SELECT * FROM t1);


      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 t1)' at line 1

      PostgreSQL and Oracle work fine on this query.

      This query returns a syntax error:

      ((SELECT a FROM t1) LIMIT 1);


      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 'LIMIT 1)' at line 1

      It should return a result. It works fine in PostreSQL. Also, it is a direct equivalent query to this Standard-compliant version:

      ((SELECT a FROM t1) FETCH FIRST 1 ROWS ONLY);

      Another example:

      SELECT * FROM (SELECT 1 UNION (SELECT 2 UNION SELECT 3)) t1;


      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 3) t1' at line 1

      The same query works in PostgreSQL.
      A similar query works in Oracle (with FROM DUAL added, and with no derived table alias)

      SELECT * FROM (SELECT 1 FROM DUAL UNION (SELECT 2 FROM DUAL UNION SELECT 3 FROM DUAL))

      Attachments

        Issue Links

          duplicates

          Task - A task that needs to be done. MDEV-11953 support of brackets (parentheses) in UNION/EXCEPT/INTERSECT operations

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-6341 INSERT ... SELECT UNION with parenthesis

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-8909 union parser cleanup

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-10029 UNION + OUTFILE is confusing

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Activity

            People

              sanja Oleksandr Byelkin
              bar Alexander Barkov
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              Dates

                Created:
                Updated:
                Resolved:

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