Updating one table from another parisian singles singles dating

Database1 (Test1) is the latest, and database2 (Test2) is an old copy of the database.I need to update the table in Test1 from the same table in Test2 for a particular column called Dept ID, because the values in the Employee table in the Test2 DB (the old one) have been updated.for example: this is some data in Table #1 ------------------------------------------------------------------------- | name | family | phone | email | gender | phone2 | address | birthdate | ------------------------------------------------------------------------- | john | doe | 12345| [email protected]| Male | | | 1980-01-01| ------------------------------------------------------------------------- | mike | clark | 65432| [email protected]| Male | | | 1990-01-01| ------------------------------------------------------------------------- | Sara | King | 875465| [email protected]|Female| | | 1970-01-01| ------------------------------------------------------------------------- ----------------------------------------- | gender | address | phone | birthdate | ----------------------------------------- | Male | 1704test|0457852|1980-01-01 | ----------------------------------------- | Female | 1705abcs|0986532|1970-01-01 | ----------------------------------------- | Male | 1602cyzd|0326589|1990-01-01 | ----------------------------------------- ------------------------------------------------------------------------- | name | family | phone | email | gender | phone2 | address | birthdate | ------------------------------------------------------------------------- | john | doe | 12345| [email protected]| Male |0457852 |1704test | 1980-01-01| ------------------------------------------------------------------------- | mike | clark | 65432| [email protected]| Male |0326589 |1602cyzd| 1990-01-01| ------------------------------------------------------------------------- | Sara | King | 875465| [email protected]|Female |0986532 |1705abcs| 1970-01-01| ------------------------------------------------------------------------- WITH CTE AS (SELECT T1.address AS tgt_address, T1.phone2 AS tgt_phone, T2.address AS source_address, T2.phone AS source_phone FROM #Table1 T1 INNER JOIN #Table2 T2 ON T1.gender = T2.gender AND T1.birthdate = T2.birthdate) UPDATE CTE SET tgt_address = source_address, tgt_phone = source_phone UPDATE T1 SET address = T2.address, phone2 = T2.phone FROM #Table1 T1 CROSS APPLY (SELECT TOP 1 * FROM #Table2 T2 WHERE T1.gender = T2.gender AND T1.birthdate = T2.birthdate ORDER BY T2.Primary Key) T2 WITH T2 AS (SELECT *, ROW_NUMBER() OVER (PARTITION BY gender, birthdate ORDER BY primarykey) AS RN FROM #Table2) UPDATE T1 SET address = T2.address, phone2 = T2.phone FROM #Table1 T1 JOIN T2 ON T1.gender = T2.gender AND T1.birthdate = T2.birthdate AND T2. I Have 2 question: 1) I think it's simple way to do this, I think this way is decrease performance and if I have about 50milion record this way is very slow, do you agree?

for example if I have color column in table #2 and its not exist on table #1, join process got error or just join columns exist in 2tables?

As a best practice, there are two main steps that you must follow to create and run an update query: create a select query that identifies the records that you want to update, and then convert that query to an update query that you can run to update the records.

Tip: You might want to back up your database before you run an update query.

------------------------------------------------------------------------- | name | family | phone | email | gender | phone2 | address | birthdate | ------------------------------------------------------------------------- in table #1 columns address and phone2 is empty and columns gender and birthdate values is same as table #2.

How can I read data from table #2 and update address and phone2 in table #1 with values from table #2 address and phone columns when gender and birthdate is the same in each row?

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You cannot undo the results of an update query, and making a backup helps make sure that you can reverse your changes if you change your mind.

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