I'm in need of a little sql help.
How do i get a list of ids from one table that do not have the same ids in
another table?
I hope that makes sense.
2  3233 
Dave wrote:
I'm in need of a little sql help.
How do i get a list of ids from one table that do not have the same ids in
another table?
I hope that makes sense.
not exact syntax, but gives you an idea...
select a.id, b.id from table1 a left join table2 b on a.id=b.id where b.id is null;
mysqlcreate table t1 (c1 integer);
Query OK, 0 rows affected (2.27 sec)
mysqlcreate table t2 (c1 integer);
Query OK, 0 rows affected (1.60 sec)
mysqlinsert into t1 values (1),(2),(3),(4) ,(5);
Query OK, 5 rows affected (0.24 sec)
Records: 5 Duplicates: 0 Warnings: 0
mysqlinsert into t2 values (1),(2),(4),(5) ;
Query OK, 4 rows affected (0.15 sec)
Records: 4 Duplicates: 0 Warnings: 0
mysqlselect t1.c1,t2.c1 from t1 left join t2 on t1.c1=t2.c1 where t2.c1 is null;
+------+------+
| c1 | c1 |
+------+------+
| 3 | NULL |
+------+------+
1 row in set (0.10 sec)
--
Michael Austin.
DBA Consultant
Donations welcomed. Http://www.firstdbasource.com/donations.html
:)
Thanks very much Michael, that's exactly what i need.
"Michael Austin" <ma*****@firstd basource.comwro te in message
news:rs******** *********@newss vr21.news.prodi gy.net...
Dave wrote:
>I'm in need of a little sql help.
How do i get a list of ids from one table that do not have the same ids
in another table?
I hope that makes sense.
not exact syntax, but gives you an idea...
select a.id, b.id from table1 a left join table2 b on a.id=b.id where b.id
is null;
mysqlcreate table t1 (c1 integer);
Query OK, 0 rows affected (2.27 sec)
mysqlcreate table t2 (c1 integer);
Query OK, 0 rows affected (1.60 sec)
mysqlinsert into t1 values (1),(2),(3),(4) ,(5);
Query OK, 5 rows affected (0.24 sec)
Records: 5 Duplicates: 0 Warnings: 0
mysqlinsert into t2 values (1),(2),(4),(5) ;
Query OK, 4 rows affected (0.15 sec)
Records: 4 Duplicates: 0 Warnings: 0
mysqlselect t1.c1,t2.c1 from t1 left join t2 on t1.c1=t2.c1 where t2.c1
is null;
+------+------+
| c1 | c1 |
+------+------+
| 3 | NULL |
+------+------+
1 row in set (0.10 sec)
--
Michael Austin.
DBA Consultant
Donations welcomed. Http://www.firstdbasource.com/donations.html
:)
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