sql - 清理我的条件 WHERE 子句

Question

这段代码有效，我只是想学习如何清理它，这样它就不会跨越很多行，并且 where 语句在几行上就很好而且整洁：

SELECT
    case_id, service_type_id 
FROM 
    cases_service_types
WHERE
    dbo.cases_service_types.service_type_id = '3'
    OR dbo.cases_service_types.service_type_id = '4'
    OR dbo.cases_service_types.service_type_id = '5'
    OR dbo.cases_service_types.service_type_id = '6'
    OR dbo.cases_service_types.service_type_id = '8'
    OR dbo.cases_service_types.service_type_id = '9'

Answer 1

SELECT
    case_id, 
    service_type_id 
FROM 
    dbo.cases_service_types
WHERE
     service_type_id IN ('3', '4', '5', '6', '8', '9' )

如果您不小心错过了“7”，那么更好的是：

SELECT
    case_id, 
    service_type_id 
FROM 
    dbo.cases_service_types
WHERE
     service_type_id BETWEEN '3' AND '9'

Answer 2

您正在寻找IN

SELECT case_id, 
       service_type_id 
FROM   cases_service_types 
WHERE  dbo.cases_service_types.service_type_id IN ( 3, 4, 5, 6, 8, 9 )