relational-division

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MySQL Select ID's which occur on different rows with multiple specific values for a column

I\'m trying to select items from an associative table that have satisfy two or more values of the same field, sounds confusing, let me explain.[详细]

2023-04-04 10:31 分类：问答
How to filter SQL results in a has-many-through relation

Assuming I have the tables student, club, and student_club: student { id name } club { id name } student_club {[详细]

2023-04-04 08:03 分类：问答
Is there a way to remove the nested query in this type of SQL SELECT?

Given this table structure and example data (t3 should not be used in the query, it is only here to show the relation between t1 and t2):[详细]

2023-02-20 21:59 分类：问答
MySQL select join where AND where

I have two tables in my database: Products id (int, primary key) name (varchar) ProductTags product_id (int)[详细]

2023-02-11 01:33 分类：问答
SELECTING with multiple WHERE conditions on same column

Ok, I think I might be overlooking something obvious/simple here... but I need to write a query that returns only records that match multiple criteria on the same column...[详细]

2023-01-22 16:57 分类：问答
Complicated SQL Query--finding items matching multiple different foreign keys

So imagine that you have a table of Products (ID int, Name nvarchar(200)), and two other tables, ProductsCategories (ProductID int, CategoryID int) and InvoiceProducts (InvoiceID int, ProductID int).[详细]

2023-01-21 18:14 分类：问答
SQL query through an intermediate table

Given the following tables: Recipes id | name 1| \'chocolate cream pie\' 2| \'banana cream pie\' 3| \'chocolate banana surprise\'[详细]

2023-01-03 11:11 分类：问答
当局着迷下一句是什么呢？？

宋习政 2022-05-25 09:23 开发者_如何学运维当局者迷，旁观者清【释义】当局者：下棋的人；旁观者：看棋的人。傍：通“旁”。当事人被碰到的事情搞糊涂了，旁观的人却看得很清楚。（指局外人清晰地看待问题，[详细]

2022-12-19 10:50 分类：问答