Question

我有两个不同的查询，如下所示 -

SELECT s.serialno, s.productid, s.description, s.in_quantity, s.uom, 
s.shiptype,s.receiveddate, s.project_id, IF(EXISTS(SELECT so.serialno 
FROM stockout so WHERE so.serialno = s.serialno),1,0) AS movementHistory
FROM stockin s WHERE s.productid = 'UKL40114/11HP'

上述查询的样本结果，限制为0,5

mysql> SELECT s.serialno, s.productid, s.description, s.in_quantity, s.uom,
    ->     s.shiptype,s.receiveddate, s.project_id, IF(EXISTS(SELECT so.serialno

    ->     FROM stockout so WHERE so.serialno = s.serialno),1,0) AS movementHist
ory
    ->     FROM stockin s WHERE s.productid = 'UKL40114/11HP' LIMIT 0, 5;
+------------+---------------+--------------------------+-------------+------+--
--------+---------------------+------------+-----------------+
| serialno   | productid     | description              | in_quantity | uom  | s
hiptype | receiveddate        | project_id | movementHistory |
+------------+---------------+--------------------------+-------------+------+--
--------+---------------------+------------+-----------------+
| A23001YKG5 | UKL40114/11HP | RADIO UNIT/RAU2 13/11 HP | 1           |    4 |
      3 | 2008-08-27 00:00:00 |          1 |               1 |
| A230024FUV | UKL40114/11HP | RADIO UNIT/RAU2 13/11 HP | 1           |    4 |
      2 | 2008-11-17 00:00:00 |          1 |               1 |
| A230024NHT | UKL40114/11HP | RADIO UNIT/RAU2 13/11 HP | 1           |    4 |
      2 | 2009-03-17 00:00:00 |          1 |               1 |
| A230024KQT | UKL40114/11HP | RADIO UNIT/RAU2 13/11 HP | 1           |    4 |
      2 | 2009-03-17 00:00:00 |          1 |               1 |
| A230024UR4 | UKL40114/11HP | RADIO UNIT/RAU2 13/11 HP | 1           |    4 |
      2 | 2009-03-17 00:00:00 |          1 |               1 |
+------------+---------------+--------------------------+-------------+------+--
--------+---------------------+------------+-----------------+
5 rows in set (0.01 sec)

和

SELECT so.out_quantity, so.serialno, so.siteid, so.employee_id, 
so.deliverytime, so.receivername 
FROM stockout so WHERE so.serialno = 'A23001RK3N'

以上查询的示例结果 -

mysql> SELECT so.out_quantity, so.serialno, so.siteid, so.employee_id, so.delive
rytime, so.receivername                           FROM stockout so WHERE so.seri
alno = 'TU8D322820';
+--------------+------------+-----------+-------------+---------------------+---
-----------+
| out_quantity | serialno   | siteid    | employee_id | deliverytime        | re
ceivername |
+--------------+------------+-----------+-------------+---------------------+---
-----------+
| 1            | TU8D322820 | 001BDS011 |          38 | 2008-06-26 10:25:00 | 0
           |
+--------------+------------+-----------+-------------+---------------------+---
-----------+
1 row in set (0.00 sec)

如果movementHistory == 1，我正在PHP页面上执行第二个查询。但是，我想与第一个查询内联执行此查询。我想跟随查询 -

SELECT s.serialno, s.productid, s.description, s.in_quantity, s.uom, s.shiptype, 
s.receiveddate, s.project_id, IF(EXISTS(SELECT so.serialno FROM stockout so WHERE
so.serialno = s.serialno),1,0) AS movementHistory
CASE movementHistory
WHEN '1' THEN (SELECT so.out_quantity, so.serialno, so.siteid, so.employee_id,
so.deliverytime, so.receivername 
FROM stockout so WHERE so.serialno = 'TU8D322820')
WHEN '0' THEN 0
END AS Policy
FROM stockin s WHERE s.productid = 'UKL40114/11HP'

我如何实现？

Answer 1

使用LEFT JOIN尝试JOINING这两个表。检查此查询：

SELECT SI.serialno
    , SI.productid
    , SI.description
    , SI.in_quantity
    , SI.uom
    , SI.shiptype
    , SI.receiveddate
    , SI.project_id
    , IFNULL(SO.out_quantity, -1) AS out_quantity
    , IFNULL(SO.siteid, '') AS siteid
    , IFNULL(SO.employee_id, -1) AS employee_id
    , IFNULL(SO.deliverytime, '') AS deliverytime
    , IFNULL(SO.receivername, -1) AS receivername
    FROM stockin SI
    LEFT JOIN stockout SO ON SO.serialno = SI.serialno
    WHERE SI.productid = 'UKL40114/11HP'
    LIMIT 0, 5;

您可以更改stockout表格返回的值NULL。检查IFNULL功能。

Answer 2

如果我理解正确，你可以试试这个：

SELECT 
    s.serialno, 
    s.productid, 
    s.description, 
    s.in_quantity, 
    s.uom, 
    s.shiptype,
    s.receiveddate, 
    s.project_id, 
    IF(EXISTS(
            SELECT 
                so.serialno 
            FROM 
                stockout so 
            WHERE 
                so.serialno = s.serialno
        ),
        1,
        0
    ) AS movementHistory,
    so.out_quantity, 
    so.serialno, 
    so.siteid, 
    so.employee_id, 
    so.deliverytime, 
    so.receivername 
FROM 
    stockin s
LEFT JOIN  stockout so
    ON so.serialno = 'A23001RK3N'
    AND IF(EXISTS(
                SELECT 
                    so1.serialno 
                FROM 
                    stockout so1 
                WHERE 
                    so1.serialno = s.serialno
            ),
            1,
            0
        ) = 1   
WHERE 
    s.productid = 'UKL40114/11HP'

将两个MySQL查询合并为一个

2 个答案: