mysql>
mysql> CREATE TABLE mytable (
-> id INT AUTO_INCREMENT,
-> begintime DATETIME,
-> endtime DATETIME,
-> PRIMARY KEY (id)
-> );
Query OK, 0 rows affected (0.01 sec)
mysql>
mysql> INSERT INTO mytable (begintime, endtime) VALUES
-> ('2005-03-27 7:15', '2005-03-27 18:00'),
-> ('2005-03-28 8:00', '2005-03-28 18:00'),
-> ('2005-03-29 7:30', '2005-03-29 16:50'),
-> ('2005-03-30 7:00', '2005-03-30 17:15');
Query OK, 4 rows affected (0.00 sec)
Records: 4 Duplicates: 0 Warnings: 0
mysql>
mysql>
mysql> SET @varname = 3;
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT @varname := 3;
+---------------+
| @varname := 3 |
+---------------+
| 3 |
+---------------+
1 row in set (0.00 sec)
mysql> SELECT @varname := COUNT(*) FROM mytable;
+----------------------+
| @varname := COUNT(*) |
+----------------------+
| 4 |
+----------------------+
1 row in set (0.00 sec)
mysql> SELECT COUNT(*) FROM mytable INTO @varname;
Query OK, 1 row affected (0.00 sec)
mysql> SELECT id, begintime FROM mytable WHERE id=1 INTO @t, @st;
Query OK, 1 row affected (0.00 sec)
mysql>
mysql>
mysql> drop table mytable;
Query OK, 0 rows affected (0.00 sec)