我有两个表叫ctgr [ctgr_id是主键]和项[item_id是主键]。
ctgr表的值为：
ctgr_id || ctgr_name
=====================
1 || laptop
2 || pc
项目表的值为：
item_id || ctgr_id || summary_ctgr_id || item_name || item_price || stock
=========================================================================
1101 || 1 || 1 || laptop1 || 100 || 100
1102 || 1 || 1 || setup1 || 0 || 0
1103 || 1 || 1 || setup2 || 0 || 0
2101 || 2 || 2 || pc1 || 200 || 50
2102 || 2 || 2 || pc2 || 300 || 50
2103 || 2 || 2 || note-pc || 500 || 30
2104 || 2 || 2 || pc3 || 400 || 50
如果我按笔记本电脑类别选择，则查询如下所示：
item_id|ctgr_id|summary_ctgr_id|item_name |item_price|stock|ctgr_name|total
=============================================================================
1101 |1 | 1 | laptop1 | 100 | 100 |laptop |200
1102 |1 | 1 | setup1 | 0 | 0 |laptop |0
1103 |1 | 1 | setup2 | 0 | 0 |laptop |0
如果按PC类别选择，则输出如下所示：
item_id|ctgr_id|summary_ctgr_id|item_name |item_price|stock|ctgr_name|total
=============================================================================
2101 |2 | 2 | pc1 | 200 | 50 |pc |0
2102 |2 | 2 | pc2 | 300 | 50 |pc |200
2103 |2 | 2 | note-pc | 500 | 30 |pc |1000
2104 |2 | 2 | pc3 | 400 | 50 |pc |400
我的查询在下面：
SELECT
item.*,
ctgr.ctgr_name,
v_sum_ord.item_total_price
FROM
item
LEFT JOIN (
SELECT
item_id,
sum(quantity) AS quantity,
sum(item_price * quantity) AS item_total_price
FROM ord_item
WHERE ord_item_status != 4
GROUP BY item_id
) v_sum_ord ON item.item_id = v_sum_ord.item_id
LEFT JOIN (
SELECT
item_set.child_id AS item_id,
sum(quantity) AS quantity,
sum(item_total_price) AS item_total_price
FROM (
SELECT
item_id,
sum(quantity) AS quantity,
sum(item_price * quantity) AS item_total_price
FROM ord_item
WHERE ord_item_status != 4
GROUP BY item_id
) v_sum_ord
INNER JOIN item_set ON v_sum_ord.item_id = item_set.item_id
GROUP BY 1
) v_sum_set_ord ON item.item_id = v_sum_set_ord.item_id
LEFT JOIN ctgr ON item.summary_ctgr_id = ctgr.ctgr_id
但是我想要如下输出：
如果我按笔记本电脑类别选择，则需要如下输出：
item_id|ctgr_id|summary_ctgr_id|item_name |item_price|stock|ctgr_name|total
=============================================================================
1101 |1 | 1 | laptop1 | 100 | 100 |laptop |200
1102 |1 | 1 | setup1 | 0 | 0 |laptop |0
1103 |1 | 1 | setup2 | 0 | 0 |laptop |0
2103 |2 | 2 | note-pc | 500 | 30 |pc |500
如果我按PC类别选择，则需要如下输出：
item_id|ctgr_id|summary_ctgr_id|item_name |item_price|stock|ctgr_name|total
=============================================================================
1101 |1 | 1 | laptop1 | 100 | 100 |laptop |200
2101 |2 | 2 | pc1 | 200 | 50 |pc |0
2102 |2 | 2 | pc2 | 300 | 50 |pc |200
2103 |2 | 2 | note-pc | 500 | 30 |pc |1000
2104 |2 | 2 | pc3 | 400 | 50 |pc |400