使用Mysql db的日期字段的case语句

Question

我试图做一个CASE声明。要求是，如果Date字段为NULL，则将其显示为“Pending”，或者显示db中的日期。

我已尝试过以下案例陈述，但存在一些问题。

CASE po_amend_received_date IS NULL WHEN 1 THEN 'Pending'  
ELSE po_amend_received_date END AS `po_amend_received_date`

我在这里犯了什么错误吗？

Answer 1

CASE WHEN po_amend_received_date IS NULL THEN 'Pending'  
else  po_amend_received_date 
end as `po_amend_received_date`