僞代碼結構到Mysql？

Question

有人可以幫助在mysql中獲得以下僞代碼嗎？在IF語句中產生的選擇都返回相同的列（4）和多行（未知），所以這不是我真正面臨的問題。如何在Mysql中獲得以下結構？

//parameters 
@p1; 
@p2; 

@v1; 
@v2; 

//vars 
@t1= 15000; 
@t2 = 15000; 

//calculated vars 
@overlap1 = (@p1 + @v1) > @t1; //boolean 
@overlap2 = (@p2 + @v2) > @t2; //boolean 
@overlap = @overlap1 OR @overlap2; //boolean 


If NOT @overlap Then //no overlap 
    CUSTOM SELECT QUERIES (UNION etc..) 
ElseIf @overlap1 AND @overlap2 //both overlaps true 
    CUSTOM SELECT QUERIES (UNION etc..) 
ElseIf @overlap1 //only @overlap1 
    CUSTOM SELECT QUERIES (UNION etc..) 
Else //only @overlap2 
    CUSTOM SELECT QUERIES (UNION etc..) 
End If 

Answer 1

我目前在php中生成正確的if/then/else部分mysql查詢。如果有人能夠正確回答問題，請做！