sql查詢將多個過濾器應用於多個表

Question

我對SQL沒有經驗，需要一個查詢將多層過濾器應用於多個表以進行比較。

表格1：

訂單編號步驟名稱數據參數名稱
12 step4 const1 P1
12 step4 const2 P2
12 step4 value1 P3
30步驟6 const3 P1
30步驟6 const4 P2
30 step6 value2 P3

所有表都具有相同的格式，只是數據值不同。 表格之間的訂單號可能會有所不同。

我想要做：

1. 僅搜索Step_Name = step1和step8之間的行
2. 查找Order_Number匹配（P1 = const1和P2 = const2）
3. 將P3行保存在相同的訂單號組中。
4. 顯示所有行（每個表一個）：

訂單編號表數據參數名稱
12表1值1 P3
12表2值2 P3
14表3值3 P3

非常感謝您的幫助！

Answer 1

您需要添加union all...select根據需要union all...select零件：

select
    order_number,
    'table1' as `table`,
    data,
    prameter_name
from
    table1 t1p3
where
    step_name in ('step1', 'step2', 'step3', 'step4', 'step5', 'step6', 'step7', 'step8') and
    parameter = 'p3' and
    exists (
        select
            'x'
        from
            table1 t1p1
        where
            t1p1.order_number = t1p3.order_number and
            t1p1.step_name = t1p3.step_name and
            t1p1.parameter = 'p1' and
            t1p1.data = 'const1'
    ) and exists (
        select
            'x'
        from
            table1 t1p2
        where
            t1p2.order_number = t1p3.order_number and
            t1p2.step_name = t1p3.step_name and
            t1p2.parameter = 'p2' and
            t1p2.data = 'const2'
    ) 
union all
select
    order_number,
    'table2',
    data,
    prameter_name
from
    table2 t2p3
where
    step_name in ('step1', 'step2', 'step3', 'step4', 'step5', 'step6', 'step7', 'step8') and
    parameter = 'p3' and
    exists (
        select
              'x'
        from
            table2 t2p1
        where
            t2p1.order_number = t2p3.order_number and
            t2p1.step_name = t2p3.step_name and
            t2p1.parameter = 'p1' and
            t2p1.data = 'const1'
    ) and exists (
        select
            'x'
        from
            table2 t2p2
        where
            t2p2.order_number = t2p3.order_number and
            t2p2.step_name = t2p3.step_name and
            t2p2.parameter = 'p2' and
            t2p2.data = 'const2'
    )