MySQL查询添加点，如果字符串有超过10个单词？
为此，请使用CASE语句。让我们首先创建一个表-
mysql> create table DemoTable -> ( -> Title text -> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values('My name is John and this is my first tutorial on MySQL');
mysql> insert into DemoTable values('This is Carol and I work on MongoDB');使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
输出结果
这将产生以下输出-
+--------------------------------------------------------+ | Title | +--------------------------------------------------------+ | My name is John and this is my first tutorial on MySQL | | This is Carol and I work on MongoDB | +--------------------------------------------------------+ 2 rows in set (0.00 sec)
以下是在字符串超过10个单词的情况下添加点的查询-
mysql> select (case when substring_index(tbl.Title, ' ', 10) = tbl.Title then tbl.Title -> else concat(substring_index(tbl.Title, ' ', 10), '....................') -> end) AS AddDots -> from DemoTable tbl;
输出结果
这将产生以下输出-
+-------------------------------------------------------------------+ | AddDots | +-------------------------------------------------------------------+ | My name is John and this is my first tutorial.................... | | This is Carol and I work on MongoDB | +-------------------------------------------------------------------+ 2 rows in set (0.00 sec)