 | Reviewing It |
| 1: | What is the purpose of SQL functions? |
| 2: | What is the DUAL table useful for? |
| 3: | Explain SQL concatenation. |
| 4: | The DECODE statement is what? |
| 5: | When might you use the HAVING clause? |
| 6: | Briefly describe what a JOIN is. |
| 7: | What is 'qualification' and why is it important to a self-join? |
| 8: | Name the four types of sub-queries. |
| 9: | What is an IN-LINE view? |
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