Question

有没有办法将变量定义为整数，然后在select语句中将计算值分配给变量，以便可以在select语句中进一步使用变量值。

declare avg integer;
select
  Round(V_COMB_PROD_CRW1.PROD_HRS * 3600 / Decode(V_COMB_PROD_CRW1.TOTAL_CYCLES,
  0, 1, V_COMB_PROD_CRW1.TOTAL_CYCLES, 20, -3))

我想将值从select移动到avg，然后在select中进一步使用avg。

Answer 1

正如大家所说，你应该使用SELECT...INTO，但不要忘记把它放在BEGIN...END部分，它不能在声明部分（每个人都省略它）< / p>

declare avg integer;
BEGIN
select Round(V_COMB_PROD_CRW1.PROD_HRS * 3600 / Decode(V_COMB_PROD_CRW1.TOTAL_CYCLES, 0, 1, V_COMB_PROD_CRW1.TOTAL_CYCLES, 20, -3))  
INTO avg
From DUAL;
END;

Answer 2

在T-SQL中你可以这样做

declare @avg integer;
set @avg = (select
            Round(V_COMB_PROD_CRW1.PROD_HRS * 3600 / Decode(V_COMB_PROD_CRW1.TOTAL_CYCLES,
            0, 1, V_COMB_PROD_CRW1.TOTAL_CYCLES, 20, -3)))
select @avg

Oracle语法应该像我记得的那样

declare avg integer
BEGIN
select Round(V_COMB_PROD_CRW1.PROD_HRS * 3600 / Decode(V_COMB_PROD_CRW1.TOTAL_CYCLES,
         0, 1, V_COMB_PROD_CRW1.TOTAL_CYCLES, 20, -3)) into avg
from dual
END

Answer 3

对于Oracle，您需要使用SELECT INTO Clause

select Round(V_COMB_PROD_CRW1.PROD_HRS * 3600 / Decode(V_COMB_PROD_CRW1.TOTAL_CYCLES, 0, 1, V_COMB_PROD_CRW1.TOTAL_CYCLES, 20, -3))  
INTO avg
From DUAL;

如果需要对多行执行此操作，则建议使用游标

declare
avg integer;
Begin
    For Cur in ( select Round(PROD_HRS * 3600 / Decode(TOTAL_CYCLES, 0, 1, TOTAL_CYCLES, 20, -3)) as avg From V_COMB_PROD_CRW1)
    Loop
        dbms_output.put_line("Processing ... "||Cur.avg);
        avg := Cur.avg ;
        -- process your code here using avg variable

    End Loop;

end;
/

Answer 4

可以在Select。

的帮助下分配值

Declare @avg Integer
Select @avg = Round(V_COMB_PROD_CRW1.PROD_HRS * 3600 / Decode(V_COMB_PROD_CRW1.TOTAL_CYCLES,
            0, 1, V_COMB_PROD_CRW1.TOTAL_CYCLES, 20, -3)))

我想将select值中的数字值分配给变量以用于进一步计算

4 个答案: