| | Sams Teach Yourself SQL in 24 Hours, Third Edition By Ronald R. Plew, Ryan K. Stephens | | Table of Contents | | | | Hour 9. Summarizing Data Results from a Query |
Q&A | Q1: | Why are NULL values ignored when using the MAX or MIN function? | | A1: | A NULL value means that nothing is there. | | Q2: | Why don't data types matter when using the COUNT function? | | A2: | The COUNT function only counts rows. | |
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