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  1. MariaDB Server
  2. MDEV-9343

Copying from YEAR to DATE result in '0000-00-00'

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Details

    • Bug
    • Status: Stalled (View Workflow)
    • Major
    • Resolution: Unresolved
    • 5.5(EOL), 10.0(EOL), 10.1(EOL), 10.2(EOL)
    • N/A
    • Data types, Temporal Types
    • None
    • Can result in unexpected behaviour
    • Q1/2026 Server Maintenance

    Description

      These scripts:

      DROP TABLE IF EXISTS t1,t2;
      		 
      CREATE TABLE t1 (a DATETIME);
      		 
      CREATE TABLE t2 (a YEAR);
      		 
      INSERT INTO t2 VALUES (2000);
      		 
      INSERT INTO t1 SELECT * FROM t2;
      		 
      SELECT * FROM t1;
      		 

      DROP TABLE IF EXISTS t1;
      		 
      CREATE TABLE t1 (a YEAR);
      		 
      INSERT INTO t1 VALUES (2000);
      		 
      ALTER TABLE t1 MODIFY a DATETIME;
      		 
      SHOW WARNINGS;
      		 
      SELECT * FROM t1;

      return

      +---------------------+
      		 
      | a                   |
      		 
      +---------------------+
      		 
      | 0000-00-00 00:00:00 |
      		 
      +---------------------+

      The year value could be preserved when NO_ZERO_IN_DATE is not set.

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-9336 ALTER from DOUBLE to TIME returns a wrong result

          • Major - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. MDEV-9344 Conversion from DOUBLE to DATETIME is inconsistent

          • Major - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. MDEV-16926 CAST(COALESCE(year_field)) returns wrong value

          • Major - Major loss of function.
          • Closed

          Activity

            People

              bar Alexander Barkov
              bar Alexander Barkov
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              3 Vote for this issue
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              Dates

                Created:
                Updated:

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