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OVERWRITE RECORDS ON TABLE FROM ANOTHER TABLE

Posted on 2008-10-13
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Last Modified: 2012-05-05
I need to replace a number of records from database1.table to database2.table , I dont want to copy them from table to table because I dont want duplicates, I want to replace records.

The ideas is restore information from a backup database to the current database, what would be the best way to write the query?
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Question by:gabepcsolutions
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Expert Comment

by:Kevin Cross
ID: 22708538
Something like this should be what you want.  Replacing the column and table names as appropriate.  ID was used to represent the link between the tables to establish same records.  If there are more fields involved in the link just add to the ON statement and add WHERE clause as needed.

If you only want to update from t1 if a valid value is there, you can use:

t2.colname = isnull(t1.colname, t2.colname)

This will leave value as is if column is null in table1.
UPDATE t2
SET t2.col1 = t1.col1
, t2.col2 = t1.col2
, t2.col3 = t1.col3
, t2.col4 = t1.col4
, t2.col5 = t1.col5
FROM Database2.dbo.Table t2 
INNER JOIN Database1.dbo.Table t1
ON t2.ID = t1.ID

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Author Comment

by:gabepcsolutions
ID: 22717098
Actually, what I need is to select all records on CLIENT LIST table that match a CODEID and replace the entire record.

For example, I did this in the past to replace the entire table.

SELECT *
INTO [PIProDev].[dbo].[CLIENT LIST]
FROM [PIPro].[dbo].[CLIENT LIST]
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Accepted Solution

by:
Kevin Cross earned 2000 total points
ID: 22720864
You can insert NEW records like this:

INSERT INTO PIProDev.dbo.[Client List]
SELECT * FROM PIPro.dbo.[Client List]
WHERE /* some condition is met */

However, keeps sounding like to me you have an EXISTING record and want to update.  You will either have to do what I suggested and hand write out each column value to replace.  Or alternatively, you will have to use the criteria to find and delete those records from the PIProDev version of table and use INSERT INTO statement above as if these were new records.

Hope that helps and I apologize for and in advance as I am out of pocket a bit this week and so my responses may be a bit delayed.
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