使用sql查询创建sql语句

Question

这是我的查询

SELECT 
'UPDATE TABLE1 SET COL_DATE = '||a.col_date||', COL_ID = '''||a.col_id||'''
WHERE COL_VAR = '''||a.col_var||''';' AS sql_query
FROM
(SELECT t2.COL_VAR AS col_var, t2.COL_DATE AS col_date, t3.COL_ID AS col_id                           
FROM TABLE2 t2 JOIN TABLE3 t3 ON t2.col_var = t3.col_var) a;

我的目标输出是这样的

  

UPDATE TABLE1 SET COL_DATE = DATE1，COL_ID =＆＃39; ID1＆＃39;在哪里COL_VAR =＆＃39; VAR1＆＃39 ;;   UPDATE TABLE1 SET COL_DATE = DATE2，COL_ID =＆＃39; ID2＆＃39;在哪里COL_VAR =＆＃39; VAR2＆＃39;;

它适用于oracle而不是mySQL ......这在mySQL中是否可行？

Answer 1

尝试如下..

SELECT 
    CONCAT('UPDATE TABLE1 SET COL_DATE = ''',
            t2.COL_DATE,
            ''', COL_ID = ''',
            t3.COL_ID,
            ''' WHERE COL_VAR = ''',
            t2.COL_VAR,
            '''')
FROM
    TABLE2 t2
        JOIN
    TABLE3 t3 ON t2.col_var = t3.col_va;