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2025-09-24 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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This article introduces to you how to achieve sub-query in mysql, the content is very detailed, interested friends can use for reference, I hope it can be helpful to you.
Subqueries can be divided into from where and subqueries.
Classification table:
[sql]
Mysql > select * from category
+-+ +
| | id | c_name |
+-+ +
| | 1 | ios |
| | 2 | android |
| | 3 | sb |
+-+ +
3 rows in set
Commodity list:
[sql]
Mysql > select * from goods
+-- +
| | id | name | cat_id | price | num | |
+-- +
| | 1 | Apple | 1 | 4999 | 2 |
| | 2 | nexus4 | 2 | 1999 | 3 |
| | 4 | Honor 2 | 2 | 1888 | 5 |
| | 6 | Samsung | 2 | 3000 | 2 |
+-- +
6 rows in se
Requirements: only find out the classification of goods under the classification
[sql]
Mysql > select * from category c where exists (select * from goods where cat_id=c.id)
+-+ +
| | id | c_name |
+-+ +
| | 1 | ios |
| | 2 | android |
+-+ +
2 rows in set
This is the end of how to realize the subquery in mysql. I hope the above content can be helpful to you and learn more knowledge. If you think the article is good, you can share it for more people to see.
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