Tsql merge example

This article is tagged with: Tsql merge example and mysql

tsql merge example

MERGE esqlProductTarget T
USING esqlProductSource S
ON (S.ProductID = T.ProductID)
WHEN MATCHED
THEN UPDATE
SET T.Name = S.Name,
T.ProductNumber = S.ProductNumber,
T.Color = S.Color
WHEN NOT MATCHED BY TARGET
THEN INSERT (ProductID, Name, ProductNumber, Color)
VALUES (S.ProductID, S.Name, S.ProductNumber, S.Color)
WHEN NOT MATCHED BY SOURCE
THEN DELETE;

t-sql merge example

MERGE sales.category t
USING sales.category_staging s
ON (s.category_id = t.category_id)
WHEN MATCHED
THEN UPDATE SET
t.category_name = s.category_name,
t.amount = s.amount
WHEN NOT MATCHED BY TARGET
THEN INSERT (category_id, category_name, amount)
VALUES (s.category_id, s.category_name, s.amount)
WHEN NOT MATCHED BY SOURCE
THEN DELETE;

tsql goup by clause in merge statement

MERGE dbo.MyTarget targ
USING (SELECT ... FROM dbo.MySource GROUP BY .....) src
ON (targ.Identifier = src.Identifier
AND targ.Name = src.ConstituentName
AND targ.Ticker = src.ConstituentTicker
AND (targ.CUSIP = src.CUSIP OR targ.ISIN = src.ISIN OR targ.SEDOL = src.SEDOL))
WHEN MATCHED THEN
-- update values
;

merge clause with inner join

MERGE table1
USING (SELECT table3.keycolumn,
table2.DataColumn1,
table2.DataColumn2
FROM table2
INNER JOIN table3
ON table2.anotherKey = table3.anotherKey
WHERE table2.anotherKey = 'A1') tmpTable
ON
table1.keyColumn = tmpTable.keyColumn
WHEN MATCHED THEN
UPDATE
SET table1.DataColumn1 = tmpTable.DataColumn1
,table1.DataColumn2 = tmpTable.DataColumn2;

This article is tagged with: Tsql merge example and mysql