如何獲得員工的姓名和身份證誰在第二個表

Question

有兩個電話號碼，這兩個表1. EMP_TABLE，2 phone_table。 如何獲得員工姓名和身份證號碼在第二個表中有兩個電話號碼

Answer 1

SELECT t1.id, 
     t1.name 
FROM emp_table t1 
INNER JOIN     -- the join will remove employees who do not have 
(       -- two phone numbers in phone_table 
    SELECT Id 
    FROM phone_table   -- this query identifies all employees 
    GROUP BY Id    -- having two phone numbers in phone_table 
    HAVING COUNT(*) = 2 
) t2 
    ON t1.id = t2.Id