SQL得到VARCHAR列布爾值

Question

爲1或0基於如果列note爲空或不

列是varchar，我想從查詢結果給我想把我的結果我要的是列boolean值note

SELECT id, product, note FROM myTABLE 

我累是什麼，

SELECT id, product, CASE WHEN ISNULL(note) THEN 0 ELSE 1 FROM myTable 

但我收到一封rror ...我相信有這個簡單的解決方案我錯過了，所以請幫助。謝謝。

Answer 1

嘗試

SELECT id, product,CASE WHEN note IS NULL THEN 0 ELSE 1 END as SomeColumn 
FROM myTable 

檢查空白和空爲好，使用NULLIF

SELECT id, product, 
CASE WHEN NULLIF(note,'') IS NULL THEN 0 ELSE 1 END as SomeColumn 
FROM myTable