SQl查詢檢索數據

Question

我無法弄清楚如何從我的表中獲取所需的數據。這是我寫的顯示錯誤說子查詢返回多行查詢..

SELECT name 
FROM `business` 
WHERE id = (
SELECT business_id 
FROM bill 
WHERE id = (
SELECT bill_id 
FROM bill_schedule 
WHERE show_bill = 1) 

這裏bill_schedule子查詢返回多行，其中show_bill是一個布爾列。所有我想在這裏是從它的show_bill設置爲1

Answer 1

SELECT `name` 
FROM `business` 
WHERE id in (
SELECT business_id 
FROM bill 
WHERE id in (
SELECT bill_id 
FROM bill_schedule 
WHERE show_bill = 1) 

Answer 2

由於子查詢返回多行的業務顯示「名稱」，則不能使用相等運算符

剛在您的where子句中將=更改爲IN：

SELECT name 
FROM `business` 
WHERE id IN (
SELECT business_id 
FROM bill 
WHERE id IN (
SELECT bill_id 
FROM bill_schedule 
WHERE show_bill = 1)