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Category: Join

MySQL 5.5.8 InnoDB Foreign Key, JOIN performance

By adminPosted on February 8, 2023

Question : We are using aws/rds, MySQL 5.5.8. all InnoDB. For performance purposes, we have merged some data-elements into varchar […]

mysql join not working as expected

By adminPosted on February 6, 2023

Question : i want to select schedule of specific teacher for a given day …. statement should assume that a […]

SQL query – Do I need a full join to produce this combined result?

By adminPosted on February 6, 2023

Question : With two tables structured like this: Table1 Table2 —————- —————- id, time, x id, time, y, z 1 […]

How to use GROUP BY after the Having clause Mysql

By adminPosted on February 6, 2023

Question : Here is the query which gets the accounts for a specific user the products are related to accounts […]

Oracle’s (+) notation within function

By adminPosted on February 5, 2023

Question : If we use (+) notation we can have outer join. For example: select * from tab_a, tab_b where […]

How to select students that failed at least at all courses that student with id = 1 failed?

By adminPosted on February 3, 2023

Question : I have the following tables: STUDENT (student_id, first_name, last_name, birth_date, year , domain) PROFESSOR (professor_id, first_name, last_name, birth_date, […]

Join or Replace colum value based on query

By adminPosted on February 3, 2023

Question : I have this query: SELECT h.name, i.name, i.delay, i.delay_flex, i.status, i.templateid, i.params, i.description FROM items as i LEFT […]

Using Join to get data from multiple tables in SQL Server [closed]

By adminPosted on February 2, 2023

Question : Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? […]

COUNT number of column values with INNER JOIN [closed]

By adminPosted on February 2, 2023

Question : Closed. This question is off-topic. It is not currently accepting answers. This question does not appear to belong […]

I am unable to join tables in correct manner

By adminPosted on January 31, 2023

Question : I have created Four Tables- 1) Registration Table – it has registration id(rid),First Name of user(fname), Last Name […]

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