SQl 查询检索数据

Question

I cannot figure out how to get the required data from my table. The query which I wrote shows an error saying subquery returns more than one row..

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

Here the subquery for bill_schedule returns more than one row, where show_bill is a boolean column. All I want here is to display the 'name' from the business whose show_bill is set to 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

Since the sub query is returning multiple rows, you can't use an equality operator

Just change the = to IN in your where clause:

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 )