在 mysql 和 laravel 中加入兩個數據庫表

Question

我有這兩張桌子。

as_tbl_company_holidays

id  year company_id start_date, end_date, description
1  2020   1 2020-01-01 2020-01-01 New Year Holiday
2  2020   1 2020-02-14 2020-02-15 Valentine Holiday
3  2020   2 2020-01-01 2020-01-01 New Year Holiday

as_tbl_employee_holidays

id employee_id company_id year start_date end_date description
1  ASL100  1  2020-01-31 2020-01-31 Casual Holiday
2 ASL200 2 2020-04-01 2020-04-02 Easter Holiday

我如何加入這兩個表以獲取特定員工的假期數據，即

id employee_id company_id year start_date end_date description
1  ASL100  1 2020 2020-01-01 2020-01-01 New Year Holiday
2 ASL100 1 2020 2020-02-14 2020-02-15 Valentine Holiday
3  ASL100 1 2020-01-31 2020-01-31 Casual Holiday

id employee_id company_id year start_date end_date description
1  ASL200 2 2020 2 2020-01-01 2020-01-01 New Year Holiday
2  ASL200 2 2020 2 2020-04-01 2020-04-02 Easter Holiday 

同時，我編寫了這個 SQL 查詢，它返回了重復的數據。 如何將兩個表中的數據合並為一個。

select 
    emp.employee_id, 
    comp.company_id, 
    comp.year, 
    comp.start_date, 
    comp.end_date 
from 
    as_tbl_company_holidays as comp 
left join as_tbl_employee_holidays as emp on comp.company_id = emp.company_id 
where 
    emp.employee_id = "ASL100" and 
    comp.company_id = 1

Answer 1

我想你需要一個union查詢而不是加入

select company_id,year, start_date, end_date,description
from as_tbl_company_holidays
where company_id = 1
union 
select company_id,year, start_date, end_date ,description
from as_tbl_employee_holidays
where company_id = 1 
  and employee_id = "ASL100"