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Can anybody tell me why the answer is 6?
I just don't understand it's going to be 6
Steven Parker218,848 Points
I assume you're asking about this question:
The EMPLOYEES table has 23 columns and the JOBS table has 4. How many COLUMNS does the following query return?
SELECT FIRST_NAME, LAST_NAME, JOBS.*
JOIN JOBS ON EMPLOYEES.JOB_ID = JOBS.ID;
If you look at what is being
SELECTed, you'll see that it is
JOBS.* which means "everything from
JOBS". So that's 2 name columns, and all 4 columns from
JOBS, for a total of 6. Make sense now?