Details
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Bug
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Status: Open (View Workflow)
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Major
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Resolution: Unresolved
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5.5, 10.0, 10.1, 10.2, 10.3, 10.4
Description
This script:
SET SQL_MODE=DEFAULT;
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DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (a DATE);
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INSERT INTO t1 VALUES ('0000-00-00'),('0000-00-00');
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SELECT a,DATE(a) FROM t1;
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returns these results as expected:
+------------+------------+
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| a | DATE(a) |
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+------------+------------+
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| 0000-00-00 | 0000-00-00 |
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| 0000-00-00 | 0000-00-00 |
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+------------+------------+
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Now if I change sql_mode and rerun the query:
SET SQL_MODE=TRADITIONAL;
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SELECT a,DATE(a) FROM t1;
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it returns
+------------+---------+
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| a | DATE(a) |
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+------------+---------+
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| 0000-00-00 | NULL |
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| 0000-00-00 | NULL |
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+------------+---------+
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Notice, the function DATE() respects TRADITIONAL (which includes NO_ZERO_DATES), but the field does not.
Equality with a zero date is also allowed in sql_mode=TRADITIONAL:
MariaDB [test]> SELECT * FROM t1 WHERE a='0000-00-00';
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+------------+
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| a |
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+------------+
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| 0000-00-00 |
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| 0000-00-00 |
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+------------+
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2 rows in set (0.00 sec)
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It's not clear that the expected behavior would be and needs a discussion.
Invalid and zero dates were added to store temporal intervals. Perhaps implementing the SQL-standard intervals and disallowing invalid/zero dates in "normal" DATE/DATETIME columns would be a solution.
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- Open
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