如何在 MySQL 中仅替换字符串中的第一个重复值
mysqlmysqli database
为此，您可以使用 REGEXP_REPLACE()。假设我们的字符串是 −
This is my first MySQL query. This is the first tutorial. I am learning for the first time.
我们只需要替换特定单词的第一次出现，假设为"first"。输出应该是 −
This is my second MySQL query. This is the first tutorial. I am learning for the first time.
让我们创建一个表 −
mysql> create table demo26 −> ( −> value text −> ); Query OK, 0 rows affected (2.04 sec)
使用 insert 命令向表中插入一些记录 −
mysql> insert into demo26 values('This is my first MySQL query. This is the first tutorial. I am learning for the first time.');
Query OK, 1 row affected (0.10 sec)
使用 select 语句显示表中的记录 −
mysql> select *from demo26;
这将产生以下输出 −
+---------------------------------------------------------------------------------------------+ | value | +---------------------------------------------------------------------------------------------+ | This is my first MySQL query. This is the first tutorial. I am learning for the first time. | +---------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)
以下是仅替换第一次出现的查询 −
mysql> update demo26 −> set value = REGEXP_REPLACE(value, 'first', 'second', 1, 1 ) ; Query OK, 1 row affected (0.19 sec) Rows matched: 1 Changed: 1 Warnings: 0
使用 select 语句显示表中的记录 −
mysql> select *from demo26;
这将产生以下输出 −
+----------------------------------------------------------------------------------------------+ | value | +----------------------------------------------------------------------------------------------+ | This is my second MySQL query. This is the first tutorial. I am learning for the first time. | +----------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)
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