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 INVENTORY table. See 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.
CREATETABLE#INVENTORY ( IDBIGINTIDENTITY(1,1)PRIMARYKEY ,ISBNVARCHAR(13) ,TITLEVARCHAR(400) ,AUTHORVARCHAR(400) ,PRICEDECIMAL(18,2) ,CREATED_DATEDATETIME ,UPDATED_DATEDATETIME ) CREATETABLE#PUBLISHER ( IDBIGINTIDENTITY(1,1)PRIMARYKEY ,ISBNVARCHAR(13) ,TITLEVARCHAR(400) ,AUTHORVARCHAR(400) ,PRICEDECIMAL(18,2) ,PUBLISHERVARCHAR(200) ,CREATED_DATEDATETIME ,UPDATED_DATEDATETIME ) INSERTINTO#INVENTORY(ISBN,TITLE,AUTHOR,PRICE,CREATED_DATE) SELECT'9990987654321','INFERNO','DOWN BROWN',90.00,GETDATE() UNIONALL SELECT'9990987654322','MONGODB TUTORIALS','DILIP',60.00,GETDATE() UNIONALL SELECT'9990987654323','SQL SERVER','KEVIN',45.00,GETDATE() UNIONALL SELECT'9990987654324','XYZ','ABC',12.00,GETDATE() INSERTINTO#PUBLISHER(ISBN,TITLE,AUTHOR,PRICE,CREATED_DATE) SELECT'9990987654321','INFERNO','DOWN BROWN',85.00,GETDATE() UNIONALL SELECT'9990987654322','MONGODB TUTORIALS','DILIP',65.00,GETDATE() UNIONALL SELECT'9990987654324','XYZ','ABC',16.00,GETDATE() |
When you will run the select query on INVENTORY and PUBLISHER table then realise that price differences. Now we have to update INVENTORY table from PUBLISHER table. See following query.
UPDATEI SETPRICE=P.PRICE FROM#INVENTORYI JOIN#PUBLISHERASP ONI.ISBN=P.ISBN SELECT*FROM#INVENTORY DROPTABLE#INVENTORY DROPTABLE#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