在结果表中显示MySQL用户定义的变量值?
使用@表示变量,使用concat_ws()在表中显示并置结果。让我们首先创建一个表-
mysql> create table DemoTable1508-> (
-> StudentFirstName varchar(20),
-> StudentLastName varchar(20)
-> );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable1508 values('Chris','Brown');mysql> insert into DemoTable1508 values('David','Miller');
mysql> insert into DemoTable1508 values('John','Doe');
使用select语句显示表中的所有记录-
mysql> select * from DemoTable1508;
这将产生以下输出-
+------------------+-----------------+| StudentFirstName | StudentLastName |
+------------------+-----------------+
| Chris | Brown |
| David | Miller |
| John | Doe |
+------------------+-----------------+
3 rows in set (0.00 sec)
这是在结果表中显示MySQL变量的查询-
mysql> select @FullName:=concat_ws('-',StudentFirstName,StudentLastName) from DemoTable1508;
这将产生以下输出-
+------------------------------------------------------------+| @FullName:=concat_ws('-',StudentFirstName,StudentLastName) |
+------------------------------------------------------------+
| Chris-Brown |
| David-Miller |
| John-Doe |
+------------------------------------------------------------+
3 rows in set (0.03 sec)
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