如何从MySQL列获取前N个字符？
用于SUBSTRING()从MySQL列中获取前N个字符。让我们首先创建一个表-
mysql>create table DemoTable ( Information text );
使用插入命令在表中插入记录-
mysql>insert into DemoTable values('MySQL is a structured query language');以下是使用select语句显示表中所有记录的查询-
mysql>select *from DemoTable;
这将产生以下输出-
+--------------------------------------+ | Information | +--------------------------------------+ | MySQL is a structured query language | +--------------------------------------+ 1 row in set (0.00 sec)
这是从列中获取前N个字符的查询。在这种情况下，我们选择前10个字符-
mysql>select substring(Information,1,10) from DemoTable;
这将产生以下输出-
+-----------------------------+ | substring(Information,1,10) | +-----------------------------+ | MySQL is a | +-----------------------------+ 1 row in set (0.00 sec)
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