count() gives 0 but count(distinct) gives 1. is this correct or
a bug or is there something wrong with my SELECT?
mysql> create table t1 (f1 int);
mysql> insert into t1 values (1);
mysql> create table t2 (f1 int,f2 int);
mysql> select t1.f1,count(t2.f2) from t1
-> left join t2 on t1.f1=t2.f1 group by t1.f1;
+------+--------------+
| f1 | count(t2.f2) |
+------+--------------+
| 1 | 0 |
+------+--------------+
1 row in set (0.00 sec)
mysql> select t1.f1,count(distinct t2.f2) from t1
-> left join t2 on t1.f1=t2.f1 group by t1.f1;
+------+-----------------------+
| f1 | count(distinct t2.f2) |
+------+-----------------------+
| 1 | 1 |
+------+-----------------------+
1 row in set (0.01 sec)
regards,
tommie
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