What is the purpose of MERGE in SQL server 2008?

Sumit Rawal answered on October 30, 2022 Popularity 2/10 Helpfulness 1/10

answer What is the purpose of MERGE in SQL server 2008?

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related What is the purpose of MERGE in SQL server 2008?

What is the purpose of MERGE in SQL server 2008?

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-- Source table
CREATE TABLE SourceTable (
    ID INT PRIMARY KEY,
    Value NVARCHAR(100)
);
INSERT INTO SourceTable VALUES (1, 'One'), (2, 'Two');

-- Target table
CREATE TABLE TargetTable (
    ID INT PRIMARY KEY,
    Value NVARCHAR(100)
);
INSERT INTO TargetTable VALUES (1, 'Uno'), (3, 'Three');

-- MERGE statement
MERGE INTO TargetTable AS target
USING SourceTable AS source
ON (target.ID = source.ID)
-- When records are matched, update the records if there is a difference
WHEN MATCHED AND target.Value <> source.Value THEN 
    UPDATE SET target.Value = source.Value
-- When no records are matched in TargetTable, insert the incoming records from SourceTable
WHEN NOT MATCHED BY TARGET THEN
    INSERT (ID, Value) VALUES (source.ID, source.Value)
-- When no records are matched in SourceTable, delete the record in TargetTable
WHEN NOT MATCHED BY SOURCE THEN
    DELETE;

-- Cleanup
DROP TABLE SourceTable;
DROP TABLE TargetTable;

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Source: chat.openai.com

Tags: merge sql sql-server

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Contributed on Sep 27 2023

Sumit Rawal

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What is the need for MERGE statement SQL ?

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The MERGE statement in SQL can be used to perform operations like INSERT, DELETE, and UPDATE, all within the same SQL query. In simple terms, the MERGE statement combines the separate INSERT, UPDATE, and DELETE statements into a single SQL query.

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Contributed on Oct 30 2022

Mohammed Jaseem Tp

0 Answers Avg Quality 2/10

What is the purpose of MERGE in SQL server 2008?

Comment

-- Source table
CREATE TABLE SourceTable (
    ID INT PRIMARY KEY,
    Value NVARCHAR(100)
);
INSERT INTO SourceTable VALUES (1, 'One'), (2, 'Two');

-- Target table
CREATE TABLE TargetTable (
    ID INT PRIMARY KEY,
    Value NVARCHAR(100)
);
INSERT INTO TargetTable VALUES (1, 'Uno'), (3, 'Three');

-- MERGE statement
MERGE INTO TargetTable AS target
USING SourceTable AS source
ON (target.ID = source.ID)
-- When records are matched, update the records if there is a difference
WHEN MATCHED AND target.Value <> source.Value THEN 
    UPDATE SET target.Value = source.Value
-- When no records are matched in TargetTable, insert the incoming records from SourceTable
WHEN NOT MATCHED BY TARGET THEN
    INSERT (ID, Value) VALUES (source.ID, source.Value)
-- When no records are matched in SourceTable, delete the record in TargetTable
WHEN NOT MATCHED BY SOURCE THEN
    DELETE;

-- Cleanup
DROP TABLE SourceTable;
DROP TABLE TargetTable;

Popularity 1/10 Helpfulness 1/10 Language sql

Source: chat.openai.com

Tags: sql-server merge sql

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Contributed on Sep 27 2023

Sumit Rawal

0 Answers Avg Quality 2/10

What is the purpose of MERGE in SQL server 2008?

Comment

-- Source table
CREATE TABLE SourceTable (
    ID INT PRIMARY KEY,
    Value NVARCHAR(100)
);
INSERT INTO SourceTable VALUES (1, 'One'), (2, 'Two');

-- Target table
CREATE TABLE TargetTable (
    ID INT PRIMARY KEY,
    Value NVARCHAR(100)
);
INSERT INTO TargetTable VALUES (1, 'Uno'), (3, 'Three');

-- MERGE statement
MERGE INTO TargetTable AS target
USING SourceTable AS source
ON (target.ID = source.ID)
-- When records are matched, update the records if there is a difference
WHEN MATCHED AND target.Value <> source.Value THEN 
    UPDATE SET target.Value = source.Value
-- When no records are matched in TargetTable, insert the incoming records from SourceTable
WHEN NOT MATCHED BY TARGET THEN
    INSERT (ID, Value) VALUES (source.ID, source.Value)
-- When no records are matched in SourceTable, delete the record in TargetTable
WHEN NOT MATCHED BY SOURCE THEN
    DELETE;

-- Cleanup
DROP TABLE SourceTable;
DROP TABLE TargetTable;

Popularity 1/10 Helpfulness 1/10 Language sql

Source: chat.openai.com

Tags: merge sql sql-server

Link to this answer
Share Copy Link

Contributed on Sep 27 2023

Sumit Rawal

0 Answers Avg Quality 2/10

What is the purpose of MERGE in SQL server 2008?

Comment

-- Source table
CREATE TABLE SourceTable (
    ID INT PRIMARY KEY,
    Value NVARCHAR(100)
);
INSERT INTO SourceTable VALUES (1, 'One'), (2, 'Two');

-- Target table
CREATE TABLE TargetTable (
    ID INT PRIMARY KEY,
    Value NVARCHAR(100)
);
INSERT INTO TargetTable VALUES (1, 'Uno'), (3, 'Three');

-- MERGE statement
MERGE INTO TargetTable AS target
USING SourceTable AS source
ON (target.ID = source.ID)
-- When records are matched, update the records if there is a difference
WHEN MATCHED AND target.Value <> source.Value THEN 
    UPDATE SET target.Value = source.Value
-- When no records are matched in TargetTable, insert the incoming records from SourceTable
WHEN NOT MATCHED BY TARGET THEN
    INSERT (ID, Value) VALUES (source.ID, source.Value)
-- When no records are matched in SourceTable, delete the record in TargetTable
WHEN NOT MATCHED BY SOURCE THEN
    DELETE;

-- Cleanup
DROP TABLE SourceTable;
DROP TABLE TargetTable;

Popularity 1/10 Helpfulness 1/10 Language sql

Source: chat.openai.com

Tags: merge sql sql-server

Link to this answer
Share Copy Link

Contributed on Sep 27 2023

Sumit Rawal

0 Answers Avg Quality 2/10

What is the purpose of MERGE in SQL server 2008?

Comment

-- Source table
CREATE TABLE SourceTable (
    ID INT PRIMARY KEY,
    Value NVARCHAR(100)
);
INSERT INTO SourceTable VALUES (1, 'One'), (2, 'Two');

-- Target table
CREATE TABLE TargetTable (
    ID INT PRIMARY KEY,
    Value NVARCHAR(100)
);
INSERT INTO TargetTable VALUES (1, 'Uno'), (3, 'Three');

-- MERGE statement
MERGE INTO TargetTable AS target
USING SourceTable AS source
ON (target.ID = source.ID)
-- When records are matched, update the records if there is a difference
WHEN MATCHED AND target.Value <> source.Value THEN 
    UPDATE SET target.Value = source.Value
-- When no records are matched in TargetTable, insert the incoming records from SourceTable
WHEN NOT MATCHED BY TARGET THEN
    INSERT (ID, Value) VALUES (source.ID, source.Value)
-- When no records are matched in SourceTable, delete the record in TargetTable
WHEN NOT MATCHED BY SOURCE THEN
    DELETE;

-- Cleanup
DROP TABLE SourceTable;
DROP TABLE TargetTable;

Popularity 1/10 Helpfulness 1/10 Language sql

Source: chat.openai.com

Tags: merge sql sql-server

Link to this answer
Share Copy Link

Contributed on Sep 27 2023

Sumit Rawal

0 Answers Avg Quality 2/10

What is the purpose of MERGE in SQL server 2008?

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What is the purpose of MERGE in SQL server 2008?

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What is the purpose of MERGE in SQL server 2008?

What is the purpose of MERGE in SQL server 2008?

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What is the purpose of MERGE in SQL server 2008?

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