Unlimited web hosting - Figure 3 -4: Records repeat table field structure.
Figure 3 -4: Records repeat table field structure. So far, this chapter has examined tables, plus the fields and records within those tables. The next step is to examine relationships between tables. Fields, Columns and Attributes The terms field, column, and attribute all mean the same thing. They are all terms used to describe a field in a table. A field applies structure and definition to a chunk of data within each repeated record. Data is not actually repeated on every record, but the structure of fields is applied to each record. So, data on each record can be different, both for the record as a whole, and for each field value. Note the use of the term can be rather than is, implying that there can be duplication across both fields and records, depending on requirements and constraints. A constraint constrains (restricts) a value. For example, in Figure 3-5 the second box showing NOT NULL for the first three fields specifies that the ISBN, PUBLISHER_ID, and PUBLICATION_ID fields can never contain NULL values in any record. Rows repeat the column structure of the table 1585670081 345333926 345336275 345438353 553293362 553298398 553293389 553293370 893402095 345323440 345334787 345308999 5553673224 5557076654 246118318 449208133 425130215 James Blish Larry Niven Isaac Azimov James Blish Isaac Azimov Isaac Azimov Isaac Azimov Isaac Azimov Isaac Azimov Larry Niven Isaac Azimov Isaac Azimov Isaac Azimov Isaac Azimov Isaac Azimov Larry Niven Kurt Vonnegut Overlook Press Ballantine Books Ballantine Books Ballantine Books Bantam Books Spectra Spectra Spectra L P Books Del Rey Books Del Rey Books Del Rey Books Books on Tape Books on Tape HarperCollins Publishing Fawcett Books Berkley Publishing Cities in Flight Ringworld Foundation A Case of Conscience Second Foundation Prelude to Foundation Foundation s Edge Foundation and Empire Foundation Footfall Foundation Foundation Foundation Foundation Foundation Lucifer s Hammer Hocus Pocus Science Fiction ISBN AUTHOR PUBLISHER TITLE GENRE PRINTED Science Fiction Science Fiction Science Fiction Science Fiction Science Fiction Science Fiction Science Fiction Science Fiction Science Fiction Science Fiction Science Fiction Science Fiction Science Fiction Science Fiction Science Fiction Modern American 30-Nov-90 31-Jul-86 31-May-79 31-Jul-96 31-Dec-85 28-Feb-83 31-Jan-20 31-Jan-51 28-Apr-83 31-May-85 30-Nov-91 40 Chapter 3
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