Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations Mike Lewis on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!

Looking for specific data using SELECT

Status
Not open for further replies.

Samus Aran

Programmer
Aug 26, 2020
1
CA
Greetings,

I am looking for a way to do some SELECT and return only specific data from my database, here is an example of the data:

Code:
+----+------+--------+--------+--------+
| ID | name | value1 | value2 | value3 |
+----+------+--------+--------+--------+
|  1 | aaaa | aaaa   | Yes    | True   |
|  2 | aaaa | bbbb   | Yes    | False  |
|  3 | aaaa | cccc   | Yes    | True   |
|  4 | aaaa | dddd   | Yes    | False  |
|  5 | aaaa | eeee   | Yes    | False  |
|  6 | bbbb | NULL   | Yes    | True   |
|  7 | bbbb | NULL   | Yes    | False  |
|  8 | bbbb | NULL   | Yes    | True   |
|  9 | bbbb | NULL   | Yes    | False  |
| 10 | cccc | ffff   | No     | True   |
| 11 | cccc | ffff   | No     | False  |
| 12 | cccc | ffff   | No     | True   |
| 13 | cccc | ffff   | No     | False  |
| 14 | cccc | gggg   | Yes    | True   |
| 15 | cccc | gggg   | Yes    | False  |
| 16 | cccc | gggg   | Yes    | True   |
| 17 | cccc | gggg   | Yes    | False  |
+----+------+--------+--------+--------+

Here are the results I am expecting:

Results 1 (first SELECT):

Code:
+----+------+--------+--------+--------+
| ID | name | value1 | value2 | value3 |
+----+------+--------+--------+--------+
|  1 | aaaa | aaaa   | Yes    | True   |
|  2 | aaaa | bbbb   | Yes    | False  |
|  3 | aaaa | cccc   | Yes    | True   |
|  4 | aaaa | dddd   | Yes    | False  |
|  5 | aaaa | eeee   | Yes    | False  |
|  6 | bbbb | NULL   | Yes    | True   |
| 10 | cccc | ffff   | No     | True   |
| 14 | cccc | gggg   | Yes    | True   |
+----+------+--------+--------+--------+

NOTE:
[ul]
[li]The column name result must follow the following restrictions:[/li]
[ul]
[li]The name must be unique unless:[/li]
[ul][li]There is another entry of name with a different value1, in which case, all the different name/value1 combos must be returned (this is mostly shown with IDs 1, 2, 3, 4, 5, 6, 10, 14 in the table, IDs 7, 8, 9, 11, 12, 13, 15, 16, 17 are not in the results because of that restriction).[/li][/ul]
[/ul]
[li]The column value1 result must follow the following restrictions:[/li]
[ul]
[li]The value1 must return all different value1 entries (according to the name restrictions), but they must not be repeated (this is mostly shown with IDs 10, 11, 12, 13, 14, 15, 16, 17 in the table, IDs 11, 12, 13, 15, 16, 17 are not in the results because of that restriction).[/li]
[li]The column value2 result has no restrictions.[/li]
[/ul]
[/ul]

Results 2 (second SELECT):

Code:
+----+------+--------+--------+--------+
| ID | name | value1 | value2 | value3 |
+----+------+--------+--------+--------+
|  1 | aaaa | aaaa   | Yes    | True   |
|  3 | aaaa | cccc   | Yes    | True   |
|  6 | bbbb | NULL   | Yes    | True   |
| 10 | cccc | ffff   | No     | True   |
| 14 | cccc | gggg   | Yes    | True   |
+----+------+--------+--------+--------+

NOTE:
[ul]
[li]The column name result must follow the following restrictions:[/li]
[ul]
[li]The name must be unique unless:[/li]
[ul][li]There is another entry of name with a different value1, in which case, all the different name/value1 combos must be returned (this is mostly shown with IDs 1, 2, 3, 4, 5, 6, 10, 14 in the table, IDs 7, 8, 9, 11, 12, 13, 15, 16, 17 are not in the results because of that restriction).[/li][/ul]
[/ul]
[li]The column value1 result must follow the following restrictions:[/li]
[ul]
[li]The value1 must return all different value1 entries (according to the name restrictions), but they must not be repeated (this is mostly shown with IDs 10, 11, 12, 13, 14, 15, 16, 17 in the table, IDs 11, 12, 13, 15, 16, 17 are not in the results because of that restriction).[/li]
[li]The column value2 result has no restrictions.[/li]
[/ul]
[li]The column value3 result must follow the following restrictions:[/li]
[ul]
[li]The value3 must be TRUE.[/li]
[/ul]
[/ul]

Unfortunately, I have no idea how to approach this.

May you help me out with this please?

Thank you for your time and help, it is greatly appreciated.
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top