Summary of Recommendations
Do as I say, not as I do.
—mid 16th century English proverb
In this appendix I present for purposes of reference a brief summary of the recommendations from Chapters 1-12. The page numbers against the various items show where the individual recommendations are discussed in the body of the text.
Don’t use SQL like a simple access method. (Page 16)
Avoid the use of any SQL construct that references physical access paths such as indexes. (Page 17)
Don’t use table to mean a base table specifically unless your intended meaning is clear from the context. (Page 24)
Don’t think of views as if they were somehow different from tables. (Page 24)
Avoid coercions wherever possible. (Page 62)
Ensure that columns with the same name are of the same type. (Page 62)
Avoid type conversions where possible. When they can’t be avoided, do them explicitly if you can. (Page 62)
Don’t use PAD SPACE. (Page 64)
Avoid possibly nondeterministic expressions. (Page 65)
Don’t use “typed tables,” reference values, REF types, or any SQL construct related to these features. (Page 67)
If you must talk about nulls, call them nulls and not “null values.” (Page 84)
Don’t use the comparison operators “<”, “<=”, “>”, and “>=” on rows of degree greater than one. (Page 88)
Use AS specifications whenever necessary (and possible) to give proper column names to columns that otherwise (a) wouldn’t have a name at all or (b) would have a name that wasn’t unique. (Pages 97, 179)
If two ...