复制并插入一行并进行一些修改

Question

我想复制一行并将其插入同一个表中，并带有一些新值。问题是我的表有大约50列，所以我的查询看起来有点愚蠢：

10000 for FR is 10 000
10000 for US is 10,000

有没有更好的方法来动态获取所有列，并且能够指定哪些列将使用新值更新？感谢

Ps：我将通过insert into DUMBTABLE ( , Col1 , Col2 , Col3 -- 47 rows to go... . . , Col50) select 'new_val1' ,'new_val2' , Col3 -- 47 rows to go again... . . . , Col50 from DUMBTABLE where Col1 = 'old_val' 运行此查询。目前，存储过程不是一种选择。

Answer 1

在我看来，你有50个变量new_val1，new_val2，...，new_val50。如果这些变量具有值，则您希望新行在相应列中具有这些值，否则您希望保留重复的行列值。基于这些假设，请参见以下代码：

sql = "insert into DUMBTABLE (
, Col1
, Col2
, Col3
-- 47 rows to go...
 .
 .
, Col50) select " + new_val1 == null ? "col1," : "'" + new_val1 + "',"
                + new_val2 == null ? "col2," : "'" + new_val2 + "',"
                + new_val3 == null ? "col3," : "'" + new_val3 + "',"
                 -- 47 rows to go again...
                 .
                 .
                 .
                + new_val50 == null ? "col50," : "'" + new_val50 + "',"
    " from DUMBTABLE where Col1 = 'old_val'";