Question

I have one table with the following data:

Table 1:

CUSIP DESC QUANTITY

1     ABC    300

1     ABC    400

1     ABC    500

I want to move this data into Table 2 but add the quantity if the cusip, and desc are the same

Table 2:

CUSIP DESC QUANTITY

1     ABC    1200

Answer 1

GROUP BY your columns and SUM the QUANTITY:

INSERT INTO Table2
   SELECT CUSIP, [DESC], SUM(QUANTITY) AS QUANTITY
   FROM Table1
   GROUP BY CUSIP, [DESC]

Here’s a demo: http://sqlfiddle.com/#!3/c2620/1/0