普遍的 PSQL GROUP BY 子句

Question

我在 Pervasive V11 数据库上进行了以下 SQL 调用。 我正在努力使每个项目 ID 只得到一行。

SELECT 
    inventory_history.item_id AS 'ItemId', 
    RTrim(inventory_items.item_name) AS 'Description', 
    If(RTrim(trx_type) = 'P',SUM(change_quantity),'') AS 'QtyChangeP', 
    If(RTrim(trx_type) = 'P',SUM(history_cost_01+history_cost_02+history_cost_03+history_cost_04+history_cost_05+history_cost_06+history_cost_07+history_cost_08+history_cost_09+history_cost_10+history_cost_11+history_cost_12),'') AS 'CostChangeP', 
    If(RTrim(trx_type) = 'S',SUM(change_quantity),'') AS 'QtyChangeS', 
    If(RTrim(trx_type) = 'S',SUM(history_cost_01+history_cost_02+history_cost_03+history_cost_04+history_cost_05+history_cost_06+history_cost_07+history_cost_08+history_cost_09+history_cost_10+history_cost_11+history_cost_12),'') AS 'CostChangeS', 
    If(RTrim(trx_type) = 'A',SUM(change_quantity),'') AS 'QtyChangeA', 
    If(RTrim(trx_type) = 'A',SUM(history_cost_01+history_cost_02+history_cost_03+history_cost_04+history_cost_05+history_cost_06+history_cost_07+history_cost_08+history_cost_09+history_cost_10+history_cost_11+history_cost_12),'') AS 'CostChangeA', 
    If(RTrim(trx_type) = 'T',SUM(change_quantity),'') AS 'QtyChangeT', 
    If(RTrim(trx_type) = 'T',SUM(history_cost_01+history_cost_02+history_cost_03+history_cost_04+history_cost_05+history_cost_06+history_cost_07+history_cost_08+history_cost_09+history_cost_10+history_cost_11+history_cost_12),'') AS 'CostChangeT', 
    If(RTrim(inventory_categories.stocked_by_factor) = 'FT',inventory_items.unit_weight,'') AS 'WtPerFt' 
FROM 
    inventory_history 
INNER JOIN 
    inventory_items ON inventory_history.item_id = inventory_items.item_id 
INNER JOIN 
    inventory_categories ON inventory_items.category_id = inventory_categories.category_id 
WHERE 
    trx_date>'20170731' 
GROUP BY 
    inventory_history.item_id, inventory_items.item_name, trx_type, stocked_by_factor, unit_weight;

就像现在一样，如果我没有在 Group By 子句中列出 trx_type、stocked_by_factor 或 unit_weight，我会从数据库收到错误消息。

删除这些字段会导致此错误：

Column invalid. Must be a group by column: trx_type in SELECT LIST.

以下是完整 SQL 调用的示例结果：

ItemId                      Description                                                                                                            QtyChangeP                                                                    CostChangeP                                                                     QtyChangeS                                                                    CostChangeS                                                                     QtyChangeA                                                                    CostChangeA                                                                     QtyChangeT                                                                    CostChangeT          WtPerFt
=========================   ==================================================   ============================================================================   ============================================================================   ============================================================================   ============================================================================   ============================================================================   ============================================================================   ============================================================================   ============================================================================   ==============
1100SM19050T2C1             1100-H19 LAMI SHIM .050"  TYPE 2, CLASS 1                                                                                 58.2400                                                                         890.00                                                                         0.0000                                                                           0.00                                                                         0.0000                                                                           0.00                                                                         0.0000                                                                           0.00         0.000000
1100SM19050T2C1             1100-H19 LAMI SHIM .050"  TYPE 2, CLASS 1                                                                                  0.0000                                                                           0.00                                                                        58.2400                                                                         890.00                                                                         0.0000                                                                           0.00                                                                         0.0000                                                                           0.00         0.000000
1100SM19085T2C1             1100-H19 LAMI SHIM .085"  TYPE 2, CLASS 1                                                                                  0.0000                                                                           0.00                                                                         0.0000                                                                           0.00                                                                         0.0000                                                                           0.00                                                                         0.0000                                                                           0.00         0.000000
1100SM19085T2C1             1100-H19 LAMI SHIM .085"  TYPE 2, CLASS 1                                                                                 19.8080                                                                         208.00                                                                         0.0000                                                                           0.00                                                                         0.0000                                                                           0.00                                                                         0.0000                                                                           0.00         0.000000
1100SM19085T2C1             1100-H19 LAMI SHIM .085"  TYPE 2, CLASS 1                                                                                  0.0000                                                                           0.00                                                                        19.8080                                                                         208.00                                                                         0.0000                                                                           0.00                                                                         0.0000                                                                           0.00         0.000000

非常感谢任何帮助。谢谢！！

Answer 1

条件应该是 sum():

的参数

sum(If(RTrim(trx_type) = 'P', change_quantity), 0) AS QtyChangeP,

通常，这将使用 case:

来编写

sum(case when RTrim(trx_type) = 'P' then change_quantity else 0 end) AS QtyChangeP,

Answer 2

没关系...经过几个小时的绞尽脑汁，答案就在我面前。我只需要将 If() 函数转换为 SUM() 函数。

这是工作电话：

SELECT 
    inventory_history.item_id AS 'ItemId', 
    RTrim(inventory_items.item_name) AS 'Description', 
    SUM(If(RTrim(trx_type) = 'P',inventory_history.change_quantity,0)) AS 'QtyChangeP', 
    SUM(If(RTrim(trx_type) = 'P',(history_cost_01+history_cost_02+history_cost_03+history_cost_04+history_cost_05+history_cost_06+history_cost_07+history_cost_08+history_cost_09+history_cost_10+history_cost_11+history_cost_12),0)) AS 'CostChangeP', 
    SUM(If(RTrim(trx_type) = 'S',inventory_history.change_quantity,0)) AS 'QtyChangeS', 
    SUM(If(RTrim(trx_type) = 'S',(history_cost_01+history_cost_02+history_cost_03+history_cost_04+history_cost_05+history_cost_06+history_cost_07+history_cost_08+history_cost_09+history_cost_10+history_cost_11+history_cost_12),0)) AS 'CostChangeS', 
    SUM(If(RTrim(trx_type) = 'A',inventory_history.change_quantity,0)) AS 'QtyChangeA', 
    SUM(If(RTrim(trx_type) = 'A',(history_cost_01+history_cost_02+history_cost_03+history_cost_04+history_cost_05+history_cost_06+history_cost_07+history_cost_08+history_cost_09+history_cost_10+history_cost_11+history_cost_12),0)) AS 'CostChangeA', 
    SUM(If(RTrim(trx_type) = 'T',inventory_history.change_quantity,0)) AS 'QtyChangeT', 
    SUM(If(RTrim(trx_type) = 'T',(history_cost_01+history_cost_02+history_cost_03+history_cost_04+history_cost_05+history_cost_06+history_cost_07+history_cost_08+history_cost_09+history_cost_10+history_cost_11+history_cost_12),0)) AS 'CostChangeT', 
    If(RTrim(inventory_categories.stocked_by_factor) = 'FT',inventory_items.unit_weight,'') AS 'WtPerFt' 
FROM 
    inventory_history 
INNER JOIN 
    inventory_items ON inventory_history.item_id = inventory_items.item_id 
INNER JOIN 
    inventory_categories ON inventory_items.category_id = inventory_categories.category_id 
WHERE 
    trx_date>'20170731' 
GROUP BY 
    inventory_history.item_id, inventory_items.item_name, stocked_by_factor, unit_weight;

普遍的 PSQL GROUP BY 子句

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