如何获取秒 table 中有两个 phone 数字的员工姓名和 ID

Question

这是两个table1.emp_table, 2.phone_table。 如何获取第二个 table

中有两个 phone 数字的员工姓名和 ID

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