Mike Yearwood
Toronto, Ontario, Canada
Information générale
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Titre:
Mdot gotcha with SQL alias M
Versions des environnements
Network:
Windows 2008 Server
Hi all
Here's an interesting problem I found in an application I inherited.
I strongly advise against single letter aliases in SQL and in VFP from the perspective of readability and maintainability. Be especially careful with M as an alias in VFP SQL.
create table tmpinvoices free (field1 c(10))
local ltDatetime
ltDatetime = datetime()
select m.field1,m.ltDatetime as tdatetime from tmpinvoices m into cursor c_Result
You will get an error that column ltDatetime is not found. OK. So drop the m. from ltDatetime, but now you are slowing your query - admittedly very little, but I don't like doing things half-fast. ;)
I tried to add this to the mdot topic on the wiki, but my changes are not being saved.
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