October 2002
Beginner
864 pages
18h 41m
English
Content preview from Sams Teach Yourself SQL in 21 Days, Fourth Edition
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Day 21
Quiz
| 1: | From which two sources can you generate SQL scripts? |
| A1: | You can generate SQL scripts from database tables and the data dictionary. |
| 2: | Will the following SQL statement work? Will the generated output work?SQL> SET ECHO OFF SQL> SET FEEDBACK OFF SQL> SPOOL CNT.SQL SQL> SELECT 'COUNT(*) FROM ' || TABLE_NAME || ';' 2 FROM CAT 3 / |
| A2: | Yes, the SQL statement will generate a SQL script, but the generated script will not work. You need SELECT 'SELECT' in front of COUNT(*):
SELECT 'SELECT COUNT(*) FROM ' || TABLE_NAME || ';' Otherwise, your output will look like COUNT(*) FROM TABLE_NAME; which is not a valid SQL statement. |
| 3: | Will the following SQL statement work? Will the generated output work?SQL> SET ECHO OFF SQL> SET FEEDBACK OFF ... |
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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.