October 2002
Beginner
864 pages
18h 41m
English
Content preview from Sams Teach Yourself SQL in 21 Days, Fourth Edition
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Bonus Day 2
Quiz
| 1: | With embedded functions, which function is resolved first, the innermost function or the outermost function? |
| A1: | The innermost function. |
| 2: | Are NULL values considered when an average of values in a column is calculated? |
| A2: | NULL values are not recognized by aggregate functions. |
| 3: | When you convert bytes to megabytes, why do you divide by 1024 twice? |
| A3: | There are 1,024 bytes in a kilobyte and 1,024 kilobytes in a megabyte. |
| 4: | What must you do to a value in a Character format before using the value in a calculation? |
| A4: | You must first convert the character to a Numeric value using a conversion function. Today, we used Oracle's conversion function called TO_NUMBER. |
Exercises
| 1: | Using the emp_tbl table, write a SQL statement using MySQL ... |
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.