I'm trying to do some SQL in C# along with an Access Database. I have two tables. Main Table and a Second Table:
MAIN TABLE
DoubleValue | | | |
----------------------------------------
1,40 | | | |
1,80 | | | |
2,00 | | | |
1,80 | | | |
1,60 | | | |
1,60 | | | |
----------------------------------------
SECOND TABLE
DoubleValue | Points | Weight |
-------------------------------
1,00 | 100 | 2 |
1,20 | 98 | 2 |
1,40 | 96 | 2 |
1,60 | 94 | 2 |
1,80 | 92 | 2 |
2,00 | 90 | 2 |
-------------------------------
I need to find all matching rows in "SECOND TABLE" based on the column "Double Value". Then for the rows that matches I want to get the value in columns "Points" and "Weight" as well as multplie those two columns and create a columns with the name "Sum" and add all three columns to the "MAIN TABLE":
MAIN TABLE - RESULT/OUTPUT
DoubleValue | Points | Weight | Sum |
-------------------------------------
1,40 | 96 | 2 | 192 |
1,80 | 92 | 2 | 184 |
2,00 | 90 | 2 | 180 |
1,80 | 92 | 2 | 184 |
1,60 | 94 | 2 | 188 |
1,60 | 94 | 2 | 188 |
-------------------------------------
The "MAIN TABLE" doesn't need to actually have the new columns "physically" inserted. I would very much prefer if they could just be displayed in the output very much like "SELECT Points * Weight AS Sum" would produce where "Sum" would be displayed but not actually inserted in the table. BUT OK, if it needs to actually be inserted then I will go with that.
How can this be done?