如何在mysql中使用if语句向字符串值添加文本

我想检查schoolid是否为1，然后在明年以两位数的形式将连字符添加到record.year中

例如，如果record.year=1997，schools.schoolid=1，那么我希望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';    

---

假设

record.year

的类型为

INT

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

，则在添加连字符时将其转换为数字：

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

---

对于

record.year=1997和schools.schoolid=5

，它应该返回

1997-02

？哦，忽略上面的内容，我没有看到

schoolid=1

限制。