SQL When语句问题 [英] SQL When Statement question

问题描述

我想知道以下引号中的"A"是什么意思...

I want to know what the ''A'' means in the following quote...

SET value =
  CASE
    WHEN (dbo.persons(ID, Name, Phone,'A') IS NULL) THEN value

推荐答案

您的示例中没有什么可以解释"A"的含义是. persons 带有四个参数，第四个是char.至于"A"的含义，请参见代码或任何注释以理解它.

There is very nothing in your example that can explain what ''A'' is. persons takes four parameter and the fourth one is char. As to the meaning of ''A'' see the code or any comment to understand it.

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