case 语句有问题，出现语法错误

Question

我正在尝试在 table 上创建一个新专栏。我没有找到问题，有什么帮助吗？

谢谢

SELECT
    R.client AS Client
    CASE Client 
        WHEN IS NOT NULL THEN 1 
        ELSE 0 
    END AS 'Real Clients'
FROM Request R

Answer 1

这是正确的语法：

SELECT
    R.client AS Client
    ,CASE WHEN Client IS NOT NULL THEN 1 ELSE 0 END AS 'Real Clients'
FROM Request R

Problem with case statement, i get a syntax error