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This query: SELECT * FROM table1 JOIN table2 ON table2.b = table1.a reads: For each row from table1, select all rows from table2 where the value of field b is equal to that of field a INNER JOIN is the most used construct in SQL: it joins two tables together, selecting only those row combinations for which a JOIN condition is true. ![]() The MERGE statement was included into the set of TSQL statements when SQL Server 2008 was introduced. To perform the UPSERT operation Microsoft introduced the MERGE statement.
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