如何将这个mysql select改成sql server select语句？

Question

我用concating其长度大于30说明这个MySQL声明..

select if (CHAR_LENGTH(description)>30,CONCAT(SUBSTRING(description,1,30), 
'.....'),description) as description from table 

如何改变这种mysql的选择到SQL Server的select语句？

Answer 1

SELECT description = CASE 
    WHEN LEN(description) > 30 THEN SUBSTRING(description, 1, 30) + '...' 
    ELSE description 
END 
FROM table 

Answer 2

SELECT LEFT（介绍，30），说明自表

Answer 3

使用CASE statement;是这样的：

SELECT 
    CASE WHEN CHAR_LENGTH(description) > 30 
    THEN SUBSTRING(description,1,30) + '.....' 
    ELSE description 
    END as description 
FROM 
    table