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Show a MySQL user-defined variables values in the result table?
Use @ for variable and concat_ws() to display concatenated result in the table. Let us first create a table −
mysql> create table DemoTable1508 -> ( -> StudentFirstName varchar(20), -> StudentLastName varchar(20) -> ); Query OK, 0 rows affected (0.55 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1508 values('Chris','Brown');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable1508 values('David','Miller');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1508 values('John','Doe');
Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −
mysql> select * from DemoTable1508;
This will produce the following output −
+------------------+-----------------+ | StudentFirstName | StudentLastName | +------------------+-----------------+ | Chris | Brown | | David | Miller | | John | Doe | +------------------+-----------------+ 3 rows in set (0.00 sec)
Here is the query to show a MySQL variable in the result table −
mysql> select @FullName:=concat_ws('-',StudentFirstName,StudentLastName) from DemoTable1508;This will produce the following output −
+------------------------------------------------------------+
| @FullName:=concat_ws('-',StudentFirstName,StudentLastName) |
+------------------------------------------------------------+
| Chris-Brown |
| David-Miller |
| John-Doe |
+------------------------------------------------------------+
3 rows in set (0.03 sec)
Updated on: 11-Dec-2019
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