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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2020/06/18 12:56:31 UTC
[GitHub] [shardingsphere] kimmking edited a comment on issue #4680: count(distinct col) renturn null
kimmking edited a comment on issue #4680:
URL: https://github.com/apache/shardingsphere/issues/4680#issuecomment-645998081
I will fix to show:
```
mysql> select avg(distinct id),name from test;
+--------------------------------+------+
| AGGREGATION_DISTINCT_DERIVED_0 | name |
+--------------------------------+------+
| NULL | NULL |
+--------------------------------+------+
1 row in set (0.04 sec)
mysql> select sum(distinct id),name from test;
+--------------------------------+------+
| AGGREGATION_DISTINCT_DERIVED_0 | name |
+--------------------------------+------+
| NULL | NULL |
+--------------------------------+------+
1 row in set (0.02 sec)
mysql> select count(distinct id),name from test;
+--------------------------------+------+
| AGGREGATION_DISTINCT_DERIVED_0 | name |
+--------------------------------+------+
| 0 | NULL |
+--------------------------------+------+
1 row in set (0.01 sec)
mysql> select min(distinct id),name from test;
+--------------------------------+------+
| AGGREGATION_DISTINCT_DERIVED_0 | name |
+--------------------------------+------+
| NULL | NULL |
+--------------------------------+------+
1 row in set (0.02 sec)
mysql>
mysql> select max(distinct id),name from test;
+--------------------------------+------+
| AGGREGATION_DISTINCT_DERIVED_0 | name |
+--------------------------------+------+
| NULL | NULL |
+--------------------------------+------+
1 row in set (0.01 sec)
mysql> select max(distinct id) as a,name from test;
+---+------+
| a | name |
+---+------+
| NULL | NULL |
+---+------+
1 row in set (0.02 sec)
mysql> select count(distinct id) as a,name from test;
+---+------+
| a | name |
+---+------+
| 0 | NULL |
+---+------+
1 row in set (0.01 sec)
mysql> select avg(distinct id) as a,name from test;
+---+------+
| a | name |
+---+------+
| NULL | NULL |
+---+------+
1 row in set (0.01 sec)
```
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