房间查询有什么情况，如果还有其他陈述？

Question

在房间数据库中也可以进行类似SQL查询[SQL CASE WHEN或IF ELSE IF]。 例如。

Select * from SampleTable
CASE 

    WHEN CreditRating <= 2  THEN 'NO TRADE'
    WHEN CreditRating  <= 4 THEN 'POOR'
    WHEN CreditRating  <= 6 THEN 'AVARAGE'
    WHEN CreditRating  = 7 THEN 'GOOD'

    ELSE 'PERFECT' 

    END AS RATING