Created
November 8, 2018 11:01
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Describes types of filtering that could be applied to related resources in M:M relations
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| --tag:-two | |
| select p.title, html | |
| from posts as p | |
| where p.id | |
| NOT in ( | |
| select post_id | |
| from posts_tags as pt | |
| inner join tags as t | |
| on t.id = pt.tag_id | |
| where t.slug IN ('two') | |
| ); | |
| | |
| --tag:one,two | |
| select p.title, html | |
| from posts as p | |
| where p.id | |
| in ( | |
| select post_id | |
| from posts_tags as pt | |
| inner join tags as t | |
| on t.id = pt.tag_id | |
| where t.slug IN ('one', 'two') | |
| ); | |
| | |
| --tag:-two | |
| select p.title, html | |
| from posts as p | |
| where p.id | |
| NOT in ( | |
| select post_id | |
| from posts_tags as pt | |
| inner join tags as t | |
| on t.id = pt.tag_id | |
| where t.slug IN ('two') | |
| ); | |
| | |
| --tag:-one,-two | |
| select p.title, html | |
| from posts as p | |
| where p.id | |
| NOT in ( | |
| select post_id | |
| from posts_tags as pt | |
| inner join tags as t | |
| on t.id = pt.tag_id | |
| where t.slug IN ('one', 'two') | |
| ); | |
| | |
| --tag: two+thee | |
| select p.title, html | |
| from posts as p | |
| where p.id | |
| in ( | |
| select pt.post_id | |
| from posts_tags as pt | |
| inner join tags as t | |
| on t.id = pt.tag_id | |
| where t.slug IN ('two', 'three') | |
| group by post_id | |
| having count('post_id') = 2 --this is imitating AND for IN, have to have group by | |
| ); | |
| |
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