如果在其他条件下如何从表中选择特定Id
问题描述：
如何在if else条件中从表中选择特定的id
how can i select perticular id from table in if else condition
答
而不是IF-ELSE你需要使用CASE [ ^ ]
这是关于主题的CodeProject文章简单使用SQL CASE表达式 [ ^ ]。
Instead of IF-ELSE you need to use CASE[^]
Here is a CodeProject article on the subject A Simple Use of SQL CASE Expression[^].
会员10694442说：
Member 10694442 said:
&我想对所有4000行执行此操作
& i want to do this for all 4000 rows
请注意，如果不使用 WHERE [ ^ ]子句然后它将影响表格上的每一行 - 更多信息 here [ ^ ]。
在你的情况下，这可行：
Be aware that if you don't filter your SQL query using a WHERE[^] clause then it will affect every row on the table - more information here[^].
In your case this would work:
select CASE WHEN [close] > [ref] THEN 'Buy' ELSE 'Sell' END
from YourTable请注意，我用方括号包围了列名，因为 close 是SQL Server的保留字之一[ ^ ]。最好避免将保留字用作列名或变量名。
Notice that I have surrounded the column names with square brackets because close is one of SQL Server's reserved words[^]. It is best practise to avoid using reserved words as column or variable names.