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create table t1(a int);
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insert into t1 values(1),(2);
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insert into t1 values(1),(2);
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set @c=0, @d=0;
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WITH RECURSIVE qn AS
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(
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select 1,0 as col from t1
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union distinct
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select 1,0 from t1
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union all
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select 3, 0*(@c:=@c+1) from qn where @c<1
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union all
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select 3, 0*(@d:=@d+1) from qn where @d<1
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)
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select * from qn;
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MariaDB [test]> create table t1(a int);
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Query OK, 0 rows affected (0.35 sec)
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MariaDB [test]> insert into t1 values(1),(2);
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Query OK, 2 rows affected (0.15 sec)
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Records: 2 Duplicates: 0 Warnings: 0
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MariaDB [test]> insert into t1 values(1),(2);
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Query OK, 2 rows affected (0.06 sec)
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Records: 2 Duplicates: 0 Warnings: 0
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MariaDB [test]> set @c=0, @d=0;
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Query OK, 0 rows affected (0.00 sec)
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MariaDB [test]> WITH RECURSIVE qn AS
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-> (
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-> select 1,0 as col from t1
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-> union distinct
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-> select 1,0 from t1
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-> union all
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-> select 3, 0*(@c:=@c+1) from qn where @c<1
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-> union all
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-> select 3, 0*(@d:=@d+1) from qn where @d<1
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-> )
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-> select * from qn;
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+---+-----+
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| 1 | col |
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+---+-----+
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| 1 | 0 |
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| 3 | 0 |
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+---+-----+
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2 rows in set (0.00 sec)
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MariaDB [test]> select 1,0 as col from t1 # expected result
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-> union distinct
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-> select 1,0 from t1
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-> union all
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-> select 3, 0
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-> union all
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-> select 3, 0;
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+---+-----+
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| 1 | col |
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+---+-----+
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| 1 | 0 |
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| 3 | 0 |
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| 3 | 0 |
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+---+-----+
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3 rows in set (0.00 sec)
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|