1:
| snum | sname | city | comm |
| Peel | London | .12 | |
| Serres | San Jose | .13 | |
| Motika | London | .11 | |
| Rifkin | Barcelona | .15 | |
| Axelrod | New York | .10 |
2:
| cnum | cname | city | rating | snum |
| Hoffman | London | |||
| Giovanni | Rome | |||
| Liu | San Jose | |||
| Grass | Berlin | |||
| Clemens | London | |||
| Cisneros | San Jose | |||
| Pereira | Rome |
3:
| onum | amt | odate | cnum | snum |
| 18.69 | 10/03/1990 | |||
| 767.19 | 10/03/1990 | |||
| 1900.10 | 10/03/1990 | |||
| 5160.45 | 10/03/1990 | |||
| 1098.16 | 10/03/1990 | |||
| 1713.23 | 10/04/1990 | |||
| 75.75 | 10/04/1990 | |||
| 4723.00 | 10/05/1990 | |||
| 1309.95 | 10/06/1990 | |||
| 9891.88 | 10/06/1990 |
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NULL............................................................. 25
NOT ............................. 25
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DISTINCT.................................................... 28
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EXISTS ......................... 63
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EXISTS ......................................................... 64
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SQL ( SQL)........................................................... 144
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SQLCODE.................................................................. 148
SQLCODE ............................. 148
WHENEVER..................................................... 149
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INDICATOR..................................................... 150
INDICATOR NULL SQL....... 151
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SQL............................................................. 153
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1.................................................................. 154
2.................................................................. 154
3.................................................................. 154
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23................................................................. 162
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SQL...................................................................................................................... 167
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FORMAT........................................................... 170
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INTERSECT MINUS........................................................ 171
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SQL ............................................................. 174
SQL .............................................................. 177
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