如何使用 SQL select 过滤带有类别的行以根据条件加入其他（多个）table？

Question

我有以下 4 tables:

**TABLE.INFO**
ID_INFO|INFO_LABLE|CODE_INFO|CATEGORY
2222001|XXXXCCCAA001|88888001|ITEM
2222002|XXXXCCCAA002|88888002|PICKUP
2222003|XXXXCCCAA003|88888002|ITEM
2222004|XXXXCCCAA004|88888001|PICKUP
2222005|XXXXCCCAA005|88888001|PICKUP
2222006|XXXXCCCAA006|88888003|SUPPLIER

**TABLE.ITEM**
ID_ITEM|ID_INFO|DETAIL_ITEM|EXPIRE_DATE
A00001|2222001|COOKIE|5/12/2017
A00002|2222003|PIE|24/11/2017

**TABLE.PICKUP**
ID_PICKUP|ID_INFO|DETAIL_PICKUP|EXPIRE_DATE
P00001|2222004|MOTOR|8/12/2017
P00002|2222005|CAR|26/11/2017
P00003|2222002|TRUCK|2/10/2017

**TABLE.SUPPLIER**
ID_SUPPLIER|ID_INFO|DETAIL_SUPPLIER|EXPIRE_DATE
S00001|2222006|BANANA GREEN|8/12/2017

我想实现选择 TABLE.INFO 上所有字段的结果，条件只有 EXPIRE_DATE < '2017-11-31' 和 CODE_INFO in (88888002,88888001)来自加入其他 table。即

ID_INFO|INFO_LABLE|CODE_INFO|CATEGORY
2222002|XXXXCCCAA002|88888002|PICKUP
2222003|XXXXCCCAA003|88888002|ITEM
2222005|XXXXCCCAA005|88888001|PICKUP

如何使用 join table 和 where 子句实现此目的？我做了如下操作，但没有用。

SELECT A.ID_INFO, A.INFO_LABLE, A.CODE-INFO, A.CATEGORY
FROM TABLE.INFO AS A
JOIN TABLE.ITEM AS B
ON A.ID_INFO = B.ID_INFO
JOIN TABLE.PICKUP AS C
ON A.ID_INFO = C.ID_INFO
JOIN TABLE.SUPPLIER AS D
ON A.ID_INFO = D.ID_INFO
WHERE A.CODE_INFO IN (88888002,88888001) AND B.DATE_EXPIRE < '2017-11-31' OR C.DATE_EXPIRE < '2017-11-31' OR D.DATE_EXPIRE < '2017-11-31';

如果每个table都有一个大记录。对于连接到每个 table 的顺序进程，它会使查询过程时间很长。有没有其他建议，什么时候TABLE.INFO会加入另一个table（TABLE.ITEM，TABLE.PICKUP，TABLE.SUPPLIER）首先根据[中的CATEGORY字段确定=24=]?

Answer 1

试一试：

SELECT A.ID_INFO, A.INFO_LABLE, A.CODE-INFO, A.CATEGORY
FROM TABLE.INFO AS A
INNER JOIN TABLE.ITEM AS B
ON A.ID_INFO = B.ID_INFO AND B.DATE_EXPIRE < '2017-11-31'
WHERE A.CODE_INFO IN (88888002,88888001)

UNION ALL

SELECT A.ID_INFO, A.INFO_LABLE, A.CODE-INFO, A.CATEGORY
FROM TABLE.INFO AS A
INNER JOIN TABLE.PICKUP AS C
ON A.ID_INFO = C.ID_INFO AND C.DATE_EXPIRE < '2017-11-31'
WHERE A.CODE_INFO IN (88888002,88888001)

UNION ALL

SELECT A.ID_INFO, A.INFO_LABLE, A.CODE-INFO, A.CATEGORY
FROM TABLE.INFO AS A
INNER JOIN TABLE.SUPPLIER AS D
ON A.ID_INFO = D.ID_INFO AND  D.DATE_EXPIRE < '2017-11-31'
WHERE A.CODE_INFO IN (88888002,88888001)

Answer 2

尝试其中一种方法。
另外，我使用了“2017-12-01”而不是“2017-11-31”。

SELECT info.id_info,
       info.info_lable,
       info.code_info,
       info.category
FROM   info
       LEFT JOIN item
              ON item.id_info = info.id_info
                 AND item.expire_date < '2017-12-01'
       LEFT JOIN pickup
              ON pickup.id_info = info.id_info
                 AND pickup.expire_date < '2017-12-01'
       LEFT JOIN supplier
              ON supplier.id_info = info.id_info
                 AND supplier.expire_date < '2017-12-01'
WHERE  info.code_info IN ( 88888001, 88888002 )
       AND ( item.expire_date IS NOT NULL
              OR pickup.expire_date IS NOT NULL
              OR supplier.expire_date IS NOT NULL );

SELECT info.id_info, info.info_lable, info.code_info, info.category
FROM   info
       INNER JOIN item
               ON item.id_info = info.id_info AND item.expire_date < '2017-12-01'
WHERE  info.code_info IN ( 88888001, 88888002 )

UNION ALL

SELECT info.id_info, info.info_lable, info.code_info, info.category
FROM   info
       INNER JOIN pickup
               ON pickup.id_info = info.id_info AND pickup.expire_date < '2017-12-01'
WHERE  info.code_info IN ( 88888001, 88888002 )

UNION ALL

SELECT info.id_info, info.info_lable, info.code_info, info.category
FROM   info
       INNER JOIN supplier
               ON supplier.id_info = info.id_info AND supplier.expire_date < '2017-12-01'
WHERE  info.code_info IN ( 88888001, 88888002 );

Answer 3

您可以使用这个查询：

SELECT *
FROM   ((SELECT info.*
         FROM   info
                INNER JOIN (SELECT *
                            FROM   item
                            WHERE  expire_date < '2017-11-30') aa 
                        ON info.id_info = aa.id_info)
        UNION ALL
        (SELECT info.*
         FROM   info
                INNER JOIN (SELECT *
                            FROM   pickup
                            WHERE  expire_date < '2017-11-30') bb
                        ON info.id_info = bb.id_info)
        UNION ALL
        (SELECT info.*
         FROM   info
                INNER JOIN (SELECT *
                            FROM   supplier
                            WHERE  expire_date < '2017-11-30') cc
                        ON info.id_info = cc.id_info))
WHERE  code_info IN ( 88888002, 88888001 )

如何使用 SQL select 过滤带有类别的行以根据条件加入其他（多个）table？

How to use SQL select to filter rows with category to join other (multiple) table based on condition?

sql

where-clause

db2-400