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Showing posts from March, 2017

SQL table copies - SELECT INTO VS INSERT INTO

Creating a new table from another table  see:  https://www.w3 schools.com/sql/sql_select_into.asp This creates a new table and inserts all the data from the oldtable  SELECT  *  INTO   newtable  FROM   oldtable You can create a new empty table from the schema of an other using a statement like SELECT  *  INTO   newtable  FROM   oldtable  WHERE   1  =  0 ; Copy data from one table into another existing table  see:  https://www.w3schools.com/sql/sql_insert_into_select.asp Insert data from one table into another  INSERT   INTO   table2  SELECT  *  FROM   table1 If you need to specify a column list (as is the cast when dealing with identity insert), the syntax is... The tips are: Brackets are required around the destination fields No brackets are required around the select fields, just like a normal select statement  You need the identity_insert flag SET IDENTITY_INSERT  table2 ON;  INSERT   INTO   table2 ( col1, col2, col3) SELECT