A SQL statement typically used to `UPDATE` records when they exist and `INSERT` them when they do not.

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Transfer tables from multiple servers into one single server [duplicate]

I have to migrate similar tables present in multiple different servers (30+) into our new server using SSIS package. What would be the right approach towards this? I was successfully able to transfer ...
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374 views

Merge Statement + Replication difference for SQL Server 2012

We have a SSIS package that will pull from a source database and run a merge statement to put the data into a "Master" database. (Eventually the "Master" database will be the source of truth, but we ...
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Equivalent of MRG_MYISAM in databases other than MySQL? [closed]

Does anyone know if other database have something equivalent to MRG_MYISAM (aka the MERGE table type/storage engine)? I know about fragmenting, but this is not quite the same AFAIK. We're using ...
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getting error when i use merge statement

I am using sql 2008 r2. when i use merge statement i am gettig error when i execute following code: merge products as trgt using updatedproducts as src on (trgt.productid = src.productid) ...
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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 ...
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Is there a way to write intelligent queries against a merge table in MySQL that represents a bunch of tables partitioned by date?

I have a set of MySQL tables that are partitioned by date, with a merge table representing all of them. For the query I am writing, the results are joined by date, so rows in table A_2012-12-05 will ...
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2k views

MERGE with OUTPUT doesn't seem to be doing the right thing

I'm adding a foreign key to a table, and removing any rows that violate the FK, copying them into a ModifiedTable_invalid table. As part of the script, I've got the following MERGE command: MERGE ...
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Merge two records in the same table, keeping foreign key relationships intact for both

I have a table, called SITES, that has three columns, lets say it looks like this: ID Name Path 1 Google http://www.google.com/ 2 Microsoft http://www.microsoft.com/ I also have ...
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oracle merge operation hangs (or loops); query tuner claims it's a cartesian product operation

I have a Merge query (open to better suggestions) that seems to cause the server to hang. (I'm not sure what it's doing, but it pegs the CPU and never completes) When I run it through the query ...
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Once in a while synchronization of the independently updated mysql databases problem

I have a production database and a test database running on MySQL with MyISAM and InnoDB tables, which are updated independently. The Production database is updated by system and sometimes by a user. ...
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SQL Server 2008 merge statement deadlocking itself

I have the following procedure (SQL Server 2008r2): create procedure usp_SaveCompanyUserData @companyId bigint, @userId bigint, @dataTable tt_CoUserdata readonly as begin set ...
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Merge replication fails on executing query

My merge replication was working fine this morning. Since an hour or 2 ago, my synchronisation status windows keeps showing this message: Thread id 3108 will wait for 15 second(s) before retrying the ...
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How to use merge hints to isolate complex queries in SQL Server

I can understand that if I join individual queries that are "individually fast" the combination may become slow because the default execution plan may be non-optimal. However when I know the number ...
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What are my locking options for a Merge statement?

I have a stored procedure that performs a MERGE statement. It seems like it locks the whole table by default when performing the merge. I'm calling this stored procedure inside of a transaction ...
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What overhead is there if I MERGE row by row?

I have a target table of about 2000 rows and I want to be able to MERGE (with HOLDLOCK) about 5-10 rows at a time into the target table. The target table doesn't get used heavily, with only 1-2 users ...
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135 views

Re-subscribing to a merge publication after edits made offline

Hypothetical Question - To help scenario planning. Let's say I have a 2008 R2 Merge Publication with 5 active subscribers. The publication is deleted and all subscriptions are removed. A week or so ...
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Oracle's Merge v. Select->Update/Insert

What is the faster statement? A MERGE or Select->Update/Insert depending on if it returns a value? I'm trying to optimize a database, but I haven't found any speed tests comparing the two. I found ...