SQL Question:

How would you append to an existing table using ALL of the values from a table?  As example:  
Table A has (col1,col2,col3).
Table B has (col1,col2,col3) with 50 records.  

How would you take all 50 records from Table B and append them to Table A (assuming the data types and lengths are the same)?


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insert into table1 (col1,col2,col3)
select col1,col2,col3 from table2

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if some record of table2 can be duplicated in table 1 then
insert into table1 (col1,col2,col3)
select t2.col1,t2.col2,t2.col3 from table2 t2 left join table1 t1 on t1.col1=t2.col1 and  t1.col2=t2.col2 and  t1.col3=t2.col3 where t1.col1 is null
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