[英]How to update fields in a table and insert it into new table with out updating the old table
I am working on java with JDBC connections and trying to perform DDL commands.我正在使用 JDBC 连接处理 java 并尝试执行 DDL 命令。 Here i had a doubt about one particular flow, can that be possible?在这里我对一个特定的流程有疑问,这可能吗? if yes, can you explain me how and what to do with example.如果是的话,你能解释一下如何以及如何处理示例吗?
I am trying to select data from item table containing item_id, sale_price, description, barcode columns and want to update barcode data for item_id = 9 and insert into item_duplicate table.我正在尝试从包含 item_id、sale_price、描述、条形码列的项目表中获取 select数据,并希望更新item_id = 9的条形码数据并插入到item_duplicate表中。 With out updating the item table.没有更新项目表。 But item_dupliacte table should contain the updated value for barcode.但是item_dupliacte表应该包含条形码的更新值。
my item_duplicate table我的 item_duplicate 表
MERGE item_duplicate AS D
USING item AS I
ON (D.item_id = I.item_id )
WHEN MATCHED
THEN UPDATE set D.part_no='new part'
WHEN NOT MATCHED BY D
THEN
INSERT (item_id,part_no,sale_price,description,barcode)
SELECT i.ITEM_ID,i.PART_NO,i.SALE_PRICE,i.DESCRIPTION,b.BARCODE
FROM item i
JOIN item_barcode b
ON b.ITEM_ID = i.ITEM_ID
WHERE i.ITEM_ID = ?
WHEN NOT MATCHED BY I
THEN DELETE;
A simple insert into select from.从 select 简单插入。
CREATE TABLE dbo.TEST
(
item_id INT NOT NULL
, barcode VARCHAR (20) NULL
, sale_price DECIMAL (14, 2) NULL
, description VARCHAR (100) NULL
, PRIMARY KEY (item_id)
)
CREATE TABLE dbo.TEST_COPY
(
item_id INT NOT NULL
, barcode VARCHAR (20) NULL
, sale_price DECIMAL (14, 2) NULL
, description VARCHAR (100) NULL
, PRIMARY KEY (item_id)
)
INSERT INTO TEST_COPY (item_id, barcode, sale_price, description) SELECT item_id, '9999' as barcode, sale_price, description FROM TEST WHERE item_id = 9
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