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Using the Output Clause with T-SQL Merge

Using output clause in merge statement

The target cannot have a FOREIGN KEY constraint, or be referenced by a FOREIGN KEY constraint. Triggers cannot be defined on the target. The target cannot participate in merge replication or updatable subscriptions for transactional replication. If parameters or variables are modified as part of an UPDATE statement, the OUTPUT clause always returns the value of the parameter or variable as it was before the statement executed instead of the modified value. The Output clause, first implemented in SQL Server 2005, can be used to return information for each row modified by an Insert, Update, Delete or Merge statement. You can use OUTPUT with an UPDATE or DELETE statement positioned on a cursor that uses WHERE CURRENT OF syntax. The OUTPUT clause is not supported in the following statements: DML statements that reference local partitioned views, distributed partitioned views, or remote tables. Dec 03, 2014 The MERGE statement supports inserting and updating rows in a table with a single operation. In order to accomplish this the MERGE statement requires both. OUTPUT _CLAUSE : OUTPUT dml_select_list INTO @table_variable output_table ( column_list ) OUTPUT dml_select_list dml_select. (My normalised table contains rows of identical data types from multiple systems - I retrieve the data from those systems individually and thus the need to merge from one source at a time) Here's an example: IF OBJECT _ID tempdb.#target IS NOT NULL DROP TABLE #target IF OBJECT.

“In the dml_table_source clause, the SELECT and WHERE clauses cannot include subqueries, aggregate functions, ranking functions, full-text predicates, user-defined functions that perform data access, or the TEXTPTR function. An OUTPUT clause that returns results to the client will always use a serial plan.”
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dELETE, uPDATE, mERGE statement, or <i>statement</i> DELETE statement that <strong>output</strong> has an <u>merge</u> OUTPUT clause will <em>using</em> <strong>clause</strong> return rows <strong>statement</strong> to <i>merge</i> <u>output</u> the <i>clause</i> client even. INSERT, you <u>output</u> can capture the results of <em>merge</em> an. And <strong>using</strong> <u>output</u> <i>clause</i> insert those <u>clause</u> results into a target table <em>using</em> or view. Note An UPDATE, additionally, oUTPUT <strong>merge</strong> clause in a nested <i>using</i> INSERT, or. 2450

Either both the INSERT statement and the nested DML statement that contains the OUTPUT clause execute, or the whole statement fails. The following restrictions apply to the target of the outer INSERT statement : The target cannot be a remote table, view, or common table expression.
design Tip <u>clause</u> <em>using</em> <em>output</em> <strong>output</strong> #107 <u>using</u> <i>statement</i> Using <i>using</i> the <i>merge</i> <em>output</em> <i>merge</i> SQL <strong>output</strong> <strong>statement</strong> MERGE <u>using</u> <em>merge</em> Statement <strong>clause</strong> for <em>using</em> <u>merge</u> Slowly <em>clause</em> Changing <strong>statement</strong> <i>clause</i> Dimension Processing. 4831

@ROWCOUNT returns the rows inserted only by the outer INSERT statement. @IDENTITY, SCOPE _IDENTITY, and IDENT _CURRENT return identity values generated only by the nested DML statement, and not those generated by the outer INSERT statement.
from_table_name Is <u>using</u> <em>using</em> a <i>output</i> column <strong>statement</strong> prefix <u>output</u> <i>output</i> that <strong>statement</strong> <u>clause</u> specifies <i>statement</i> a <em>using</em> <em>clause</em> table included in the <u>clause</u> FROM clause of a DELETE, or <strong>using</strong> MERGE <em>output</em> statement that is used to specify <em>merge</em> the <u>merge</u> <em>using</em> <em>merge</em> rows <u>using</u> to update <em>clause</em> or delete. UPDATE, 1681

If the table being modified is also specified in the FROM clause, any reference to columns in that table must be qualified with the INSERTED or DELETED prefix. Specifies that all columns affected by the delete, insert, or update action will be returned in the order in which.

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Using output clause in merge statement
The OUTPUT clause may be useful to retrieve the value of identity or computed columns after an INSERT or UPDATE operation. When a computed column is included in the dml_select_list, the corresponding column in the output table or table variable is not a computed column.
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