多条数据更新,

UPDATE 不支持 别名, INSERT 支持别名

UPDATE user SET 
age = CASE id 
WHEN 1 THEN '16' 
WHEN 2 THEN '15' 
END,
name = CASE id 
WHEN 1 THEN 'tom' 
WHEN 2 THEN 'jim' 
END   
WHERE id  IN (1,2)  AND  id1  IN (11,22) 

联合查询

SELECT 
B.* from T_DB_EXPRESS_APP_ORDER  as A  
LEFT OUTER JOIN   
T_DB_EXPRESS_APP as B    
on 
A.userid = B.userid 
AND A.appId = B.appId  
WHERE A.userid = '099921' 
AND (B.type = '1' OR B.type = '2')