Don't Insert Duplicate Rows
Hi, I need to insert rows into table1 from table2 and table3 but I don't want to insert repeated combinations of col2, col3. So, table1 has the primary key col2, col3.
This the table1:
create table table1(
col1 int not null,
col2 int not null,
col3 int not null,
constraint PK_table1 primary key (col2, col3)
)
This is my "insert" code:
INSERT INTO table1
SELECT table2.col1,table2.col2, table3.col3
FROM table2, table3
WHERE table2.col1 = table3.col1
Wich conditions shoud i add to this code?
Thanks.
fmilano.
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