Details
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Bug
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Status: Closed (View Workflow)
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Minor
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Resolution: Duplicate
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10.0, 10.1, 10.2, 10.3
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Windows 2012 R2 Server, Ubuntu LTS 16.04.2
Description
I found out there is different behavior in different collations for UTF8 escape wildcard LIKE matching.
mysql> SET collation_connection = utf8_unicode_ci;
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Query OK, 0 rows affected (0.00 sec)
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|
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mysql> SELECT '\%b' LIKE '%\%';
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+------------------+
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| '\%b' LIKE '%\%' |
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+------------------+
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| 1 |
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+------------------+
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1 row in set (0.00 sec)
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|
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mysql> SET collation_connection = utf8_general_ci;
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Query OK, 0 rows affected (0.00 sec)
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|
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mysql> SELECT '\%b' LIKE '%\%';
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+------------------+
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| '\%b' LIKE '%\%' |
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+------------------+
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| 0 |
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+------------------+
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1 row in set (0.00 sec)
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|
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mysql> SET collation_connection = utf8mb4_unicode_ci;
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Query OK, 0 rows affected (0.00 sec)
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|
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mysql> SELECT '\%b' LIKE '%\%';
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+------------------+
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| '\%b' LIKE '%\%' |
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+------------------+
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| 1 |
|
+------------------+
|
1 row in set (0.00 sec)
|
|
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mysql> SET collation_connection = utf8mb4_general_ci;
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Query OK, 0 rows affected (0.00 sec)
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|
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mysql> SELECT '\%b' LIKE '%\%';
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+------------------+
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| '\%b' LIKE '%\%' |
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+------------------+
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| 0 |
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+------------------+
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1 row in set (0.00 sec)
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|
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mysql> SET collation_connection = utf8mb4_unicode_520_ci;
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Query OK, 0 rows affected (0.00 sec)
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|
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mysql> SELECT '\%b' LIKE '%\%';
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+------------------+
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| '\%b' LIKE '%\%' |
|
+------------------+
|
| 1 |
|
+------------------+
|
1 row in set (0.00 sec)
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I found out this problem on MySQL for a long time ago, but it says to use another collation instead, is there any ways to solve it?
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