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Perform search/replace for only the first occurrence of a character with session variable in MySQL
To perform search/ replace for only the first occurrence, use the CONCAT and REPLACE() function.
The query is as follows to set user defined session variable −
mysql> set @Sentence='Thks ks is a my string'; Query OK, 0 rows affected (0.00 sec)
In this k will be replaced with i only once. The query is as follows. We have used INSTR() also −
mysql> select @Sentence as NewString ,CONCAT(REPLACE(LEFT(@Sentence, INSTR(@Sentence, 'k')), 'k', 'i'), -> SUBSTRING(@Sentence, INSTR(@Sentence, 'k') + 1)) as ChangeOnlyOneTime;
The following is the output displaying only the first occurrence of a character is replaced −
+------------------------+------------------------+ | NewString | ChangeOnlyOneTime | +------------------------+------------------------+ | Thks ks is a my string | This ks is a my string | +------------------------+------------------------+ 1 row in set (0.00 sec)
Updated on: 30-Jul-2019
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