LanguageTable
language_ID | language
1 | english
2 | german
3 | french
EmployeeTable
employee_ID | language_ID
1 | 1
2 | 2
2 | 3
3 | 3
4 | 2
Select the employee who speaks German and French
And don't tell me
SELECT EmployeeTable.employee_ID FROM EmployeeTable WHERE language_ID = 3 & 2
because that doesn't work
select a.employee_ID from EmployeeTable a join EmployeeTable b on a.employee_ID =b.employee_ID where a.language_ID='2' and b.language_ID='3'
尝试这个
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