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Mdot gotcha with SQL alias M
Message
From
08/07/2010 13:31:14
Mike Yearwood
Toronto, Ontario, Canada
 
 
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General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Title:
Mdot gotcha with SQL alias M
Environment versions
Visual FoxPro:
VFP 9 SP2
OS:
Vista
Network:
Windows 2008 Server
Database:
MS SQL Server
Application:
Desktop
Miscellaneous
Thread ID:
01471907
Message ID:
01471907
Views:
131
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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