A SQL statement that can conditionally insert, update, or delete target rows.

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36
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1answer
27k views

MERGE a subset of the target table

I am trying to use a MERGE statement to insert or delete rows from a table, but I only want to act on a subset of those rows. The documentation for MERGE has a pretty strongly worded warning: It ...
3
votes
2answers
3k views

Can I optimize this MERGE statement?

I am attempting a single column merge between two tables. The first table (VisitorSession) has 40,000,000 rows. The second (ShoppingCart) has 9,000,000 rows. In my development environment, the query ...
7
votes
1answer
440 views

Merge row size overflow in SQL Server - “Cannot create a row of size..”

The target table to which I'm trying to merge the data has ~660 columns. The code for the merge: MERGE TBL_BM_HSD_SUBJECT_AN_1 AS targetTable USING ( SELECT * FROM ...
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votes
2answers
4k views

How to insert or update using single query?

I have a table test having columns id which primary key and auto incremented and name. I want to insert a new record if annd only if there are no records.For example input is id=30122 and name =john ...