根据上个SQL语句,如果要根据产品名称把产品的实时数量更新到一个tb_current中
时间: 2024-10-17 20:11:48 浏览: 32
如果要在`tb_current`表中根据产品名称更新实时数量(curnumber),你需要一个新的SQL INSERT INTO语句。假设`tb_current`表已经有了产品ID作为唯一标识字段,结构类似下面这样:
```sql
CREATE TABLE IF NOT EXISTS tb_current (
ProductID INT PRIMARY KEY,
ProductName VARCHAR(255),
CurrentQuantity DECIMAL(10, 2)
);
```
你可以使用以下SQL来插入计算后的实时数量:
```sql
INSERT INTO tb_current (ProductName, CurrentQuantity)
SELECT T1.ProductName, T1.RealNumber - COALESCE(T2.RealNumber, 0) + COALESCE(T3.RealNumber, 0)
FROM tb1_Inventory T1
LEFT JOIN tb2_Input T2 ON T1.ProductName = T2.ProductName AND T2.InputDate = (SELECT MAX(InputDate) FROM tb2_Input WHERE InventoryDate <= T1.InventoryDate)
LEFT JOIN tb5_Operatolog T3 ON T1.ProductName = T3.ProductName AND T3.LogDate = (SELECT MIN(LogDate) FROM tb5_Operatolog WHERE InventoryDate >= T1.InventoryDate)
WHERE T1.InventoryDate = (SELECT MAX(InventoryDate) FROM tb1_Inventory);
```
这里使用了LEFT JOIN,因为有可能没有输入或操作日志对应某一天,所以COALESCE函数用于处理NULL值,如果某项不存在,则取0。
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