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row constructor used to evaluate return of subquery
Posted by: Grum De Henseler
Date: December 21, 2016 07:06PM

I have the following table

mysql> desc rt1;
+-------+---------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------------------+------+-----+---------+----------------+
| id | bigint(20) unsigned | NO | PRI | NULL | auto_increment |
| val1 | int(11) | YES | | NULL | |
| val2 | int(11) | YES | | NULL | |
| val3 | int(11) | YES | | NULL | |
+-------+---------------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)


mysql> select * From rt1;
+----+------+------+------+
| id | val1 | val2 | val3 |
+----+------+------+------+
| 1 | 1 | 2 | 3 |
| 2 | 1 | 2 | 2 |
| 3 | 2 | 2 | 3 |
| 4 | 1 | 3 | 3 |
| 5 | 1 | 2 | 3 |
| 6 | 3 | 3 | 3 |
| 7 | 3 | 2 | 3 |
| 8 | 1 | 1 | 1 |
| 9 | 0 | 1 | 1 |
| 10 | 0 | 3 | 1 |
| 11 | 3 | 0 | 1 |
| 12 | 2 | 0 | 1 |
| 13 | 0 | 3 | 1 |
| 14 | 0 | 2 | 1 |
+----+------+------+------+
14 rows in set (0.00 sec)

When I issue
select * from rt1 where row(val1,val2) >= (select val1, val2 from rt1 where id = 2) ;
I get
+----+------+------+------+
| id | val1 | val2 | val3 |
+----+------+------+------+
| 1 | 1 | 2 | 3 |
| 2 | 1 | 2 | 2 |
| 3 | 2 | 2 | 3 |
| 4 | 1 | 3 | 3 |
| 5 | 1 | 2 | 3 |
| 6 | 3 | 3 | 3 |
| 7 | 3 | 2 | 3 |
| 11 | 3 | 0 | 1 |
| 12 | 2 | 0 | 1 |
+----+------+------+------+
9 rows in set (0.00 sec)

rows with id 11 and 12 shouldn't appear in the result set.

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row constructor used to evaluate return of subquery
December 21, 2016 07:06PM


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