如何使用，如果在mysql中陳述文字添加到字符串值

Question

我要檢查，如果schoolid爲1，則在兩位數形式添加連字符明年record.year

例如，如果record.year = 1997年，schools.schoolid = 1，那麼我想record.year返回1997-98。

$sqlquery = 'SELECT 
     record.year, 
     schools.school, 
     schools.schoolid, 
     sports.sport, 
     conferences.conference, 
     record.year 
    FROM 
     `record`, 
     `schools`, 
     `conferences`, 
     `sports` 
    WHERE 
     schools.schoolid = record.schoolid 
    AND 
     sports.sportid = record.sportid 
    AND 
     record.conferenceid = conferences.conferenceid';  

Answer 1

假設record.year是INT類型的，

SELECT  
IF 
(
    schools.schoolid = 1, 
    CONCAT(record.year,'-',RIGHT(record.year+1,2)), 
    record.year 
) AS year, 
schools.school, 
.... 

如果record.year是varchar只是將它轉換爲數字添加連字符時：

SELECT  
IF 
(
    schools.schoolid = 1, 
    CONCAT(record.year,'-',RIGHT(CAST(record.year AS SIGNED)+1,2)), 
    record.year 
) AS year, 
schools.school, 
....