June 2010
Intermediate to advanced
328 pages
7h 51m
English
Content preview from SQL Antipatterns
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Objective: Reduce Typing
Software developers don’t seem to like to type, which in a way makes their choice of career ironic, like the twist ending in an O. Henry story.
One example that programmers cite as requiring too much typing is when writing all the columns used in an SQL query:
| Implicit-Columns/obj/select-explicit.sql | |
| | SELECT bug_id, date_reported, summary, description, resolution, |
| | reported_by, assigned_to, verified_by, status, priority, hours |
| | FROM Bugs; |
It’s no surprise that software developers gratefully use the SQL wildcard feature. The * symbol means every column, so the list of columns is implicit rather than explicit. This helps make queries more concise.
| Implicit-Columns/obj/select-implicit.sql | |
| | SELECT * FROM Bugs; ... |
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