SQL 查詢通過檢查條件將數據從一個表插入另一個表

Question

表中有兩列，一列中值的符號（正或負）應與另一列中值的符號匹配。

例如：如果單位 =-1，那么金額=-1000 如果單位=1，那么金額=1000

我以這種方式嘗試過，它不起作用並拋出錯誤“語法錯誤”

INSERT INTO Table2
SELECT
CASE
When units = units * 1 and amount = amount *1 
then amount = amount *1 
When units = units * -1 and amount = amount *-1 
then amount = amount *-1 
When units = units * -1 and amount = amount *1 
then amount = amount *-1 
When units = units * 1 and amount = amount *-1 
then amount = amount * -(-1) ;
end
from Table 1;

Answer 1

檢查from Table1;

INSERT INTO Table2
SELECT
CASE
When units = units * 1 and amount = amount * 1 
then amount = amount * 1 
When units = units * -1 and amount = amount * -1 
then amount = amount * -1 
When units = units * -1 and amount = amount * 1 
then amount = amount * -1 
When units = units * 1 and amount = amount * -1 
then amount = amount * -(-1) ;
end
from Table1;