newbie_girl - 1 year ago 61

SQL Question

In order to get final results I need to write lots of queries:

`SELECT min(x) from table WHERE column1='ab' AND column2='3';`

SELECT min(y) from table WHERE column1='ab' AND column2='3';

SELECT max(x) from table WHERE column1='ab' AND column2='3';

SELECT max(y) from table WHERE column1='ab' AND column2='3';

SELECT min(x) from table WHERE column1='ab' AND column2='4';

SELECT min(y) from table WHERE column1='ab' AND column2='4';

SELECT max(x) from table WHERE column1='ab' AND column2='4';

SELECT max(y) from table WHERE column1='ab' AND column2='4';

...

where

`column2`

`3-8`

I guess I can

`CASE`

`FOR`

`column2`

Wanted result:

`column2 | minx | miny | maxx | maxy |`

3 | number | number | number | number |

4 | number | number | number | number |

5 | number | number | number | number |

6 | number | number | number | number |

7 | number | number | number | number |

8 | number | number | number | number |

Any help appriciated!

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Answer Source

Not sure how you'd use a case in that but seems like a simple use for a group by statement.

```
SELECT Column2, Min(x), Min(y), Max(x), Max(y)
FROM table
WHERE Column1='ab' AND Column2 > 2 AND Column2 < 9 GROUP BY Column2
```

I normally do T-SQL for MS-SQL but this is pretty basic so I expect this will work on Postgres