Suppose we have a table INVENTORY (books data) and another table PUBLISHER. We need update daily INVENTORY table due to price fluctuation by PUBLISHER. We will use bulk update to update the INVENTORY table. See the following query.
First, run the following script it will create two temp tables INVENTORY and PUBLISHER with some data latter we will run the bulk update query.
CREATE TABLE #INVENTORY
(
ID BIGINT IDENTITY(1,1) PRIMARY KEY
,ISBN VARCHAR(13)
,TITLE VARCHAR(400)
,AUTHOR VARCHAR(400)
,PRICE DECIMAL(18,2)
,CREATED_DATE DATETIME
,UPDATED_DATE DATETIME
)
CREATE TABLE #PUBLISHER
(
ID BIGINT IDENTITY(1,1) PRIMARY KEY
,ISBN VARCHAR(13)
,TITLE VARCHAR(400)
,AUTHOR VARCHAR(400)
,PRICE DECIMAL(18,2)
,PUBLISHER VARCHAR(200)
,CREATED_DATE DATETIME
,UPDATED_DATE DATETIME
)
INSERT INTO #INVENTORY(ISBN,TITLE,AUTHOR,PRICE,CREATED_DATE)
SELECT '9990987654321','INFERNO','DOWN BROWN',90.00,GETDATE()
UNION ALL
SELECT '9990987654322','MONGODB TUTORIALS','DILIP',60.00,GETDATE()
UNION ALL
SELECT '9990987654323','SQL SERVER','KEVIN',45.00,GETDATE()
UNION ALL
SELECT '9990987654324','XYZ','ABC',12.00,GETDATE()
INSERT INTO #PUBLISHER(ISBN,TITLE,AUTHOR,PRICE,CREATED_DATE)
SELECT '9990987654321','INFERNO','DOWN BROWN',85.00,GETDATE()
UNION ALL
SELECT '9990987654322','MONGODB TUTORIALS','DILIP',65.00,GETDATE()
UNION ALL
SELECT '9990987654324','XYZ','ABC',16.00,GETDATE()
|
When you will run the select query on INVENTORY and PUBLISHER table then realize that price differences. Now we have to update INVENTORY table from PUBLISHER table. See following query.
UPDATE I
SET PRICE = P.PRICE
FROM #INVENTORY I
JOIN #PUBLISHER AS P
ON I.ISBN=P.ISBN
SELECT * FROM #INVENTORY
DROP TABLE #INVENTORY
DROP TABLE #PUBLISHER
|
Result
ID ISBN TITLE AUTHOR PRICE CREATED_DATE UPDATED_DATE
----- ------------- ------------------ ------------- -------- ----------------------- -------------
1 9990987654321 INFERNO DOWN BROWN 85.00 2016-07-20 16:55:30.990 NULL
2 9990987654322 MONGODB TUTORIALS DILIP 65.00 2016-07-20 16:55:30.990 NULL
3 9990987654323 SQL SERVER KEVIN 45.00 2016-07-20 16:55:30.990 NULL
4 9990987654324 XYZ ABC 16.00 2016-07-20 16:55:30.990 NULL
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