如何將這個mysql select改成sql server select語句？

Question

我用concating其長度大於30說明這個MySQL聲明..

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

如何改變這種mysql的選擇到SQL Server的select語句？

Answer 1

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

Answer 2

SELECT LEFT（介紹，30），說明自表

Answer 3

使用CASE statement;是這樣的：

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