WebNov 11, 2024 · 1. Using SUM instead of COUNT also can give you what you want: SELECT department.name, SUM (CASE WHEN employees.id IS NOT NULL THEN 1 ELSE 0 END) AS 'employees_number' FROM department LEFT JOIN employees ON employees.department_id = department.id GROUP BY department.id, department.name; WebThorsten Kettner 1 2024-04-25 13:05:05. ID_USU is one of two primary keys in USUARIOS. No. A table can have just one primary key. It can have more than one unique key, but you can only make one of them primary. What you mistakenly did …
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WebJul 7, 2024 · Check out professional insights posted by Thorsten Kettner, Innovation and IP Manager. ... Student Workshop @Wilo. December 19, 2024. 14 likes. Wilo Innovation … Web编写嵌套SQL查询. select MAX(marks) from (select Marks ,subjects.name as SJN ,studentdata.name from (studentdata inner Join marks On studentdata.studentid = marks.studentid) Inner Join subjects On subjects.subjectid = marks.subjectid) where SJN in (select name from subjects); 但是它只给出了一个result.Please,帮助我开发一个 ... does ibs cause pain in back