According to Microsoft Themselves:

SQL: Error correlating fields 
Visual Studio .NET 2003

An outer reference can be used only in syntax similar to the following:

X = Y

Syntax such as X = Y + 1 or X = 5 will produce this error.

Dave

-----Original Message-----
From: ProFox [mailto:profox-boun...@leafe.com] On Behalf Of Koen Piller
Sent: 08 August 2017 16:40
To: ProFox Email List <profox@leafe.com>
Subject: Re: SQL Error

Hi,

Please note:

select .T.;
    FROM cwkt;
    where;
    cwkt.clcode=ctwc.clcode And cwkt.wccode=ctwc.wccode And;
    (cwkt.trndate BETWEEN ctwc.validfr AND ctwc.validto);
    order By funccode, trndate, clcode, wccode, wonbr Into Cursor temp

gives a result

and

select .T. ;
    From ctwc;
    where;
    cwkt.clcode=ctwc.clcode And cwkt.wccode=ctwc.wccode And;
    cwkt.trndate<ctwc.validto AND cwkt.trndate>validfr ;
    order By funccode, trndate, clcode, wccode, wonbr Into Cursor temp

errors: Column funccode is not found.

queries are identical however query 1 uses between etc and query 2 uses < etc

and query3 with the VFP between function:

select .T.;
    FROM cwkt;
    where;
    cwkt.clcode=ctwc.clcode And cwkt.wccode=ctwc.wccode And;
    BETWEEN(cwkt.trndate, ctwc.validfr, ctwc.validto);
    order By funccode, trndate, clcode, wccode, wonbr Into Cursor temp

also gives a result

for you to test yourselve:

CREATE CURSOR cwkt ( funccode C(2), trndate d, clcode c(10), wccode c(10), 
wonbr c(1)) INSERT INTO cwkt( funccode,trndate,clcode,wccode,wonbr) VALUES 
("AB", {^2017.01.01}, "DD", "BB", "1") INSERT INTO cwkt( 
funccode,trndate,clcode,wccode,wonbr) VALUES ("TW", {^2017.08.01}, "DA", "BA", 
"2") INSERT INTO cwkt( funccode,trndate,clcode,wccode,wonbr) VALUES ("TW", 
{^2017.03.01}, "DB", "BC", "3") INSERT INTO cwkt( 
funccode,trndate,clcode,wccode,wonbr) VALUES ("TW", {^2017.04.01}, "DC", "BD", 
"4")

CREATE CURSOR ctwc ( clcode c(10), wccode c(10),validfr d, validto d) INSERT 
INTO CTWC( clcode, wccode, validfr, validto) VALUES ("AC", "BB",
{^2017.01.01},{^2017.01.01})
INSERT INTO CTWC( clcode, wccode, validfr, validto) VALUES ("DA", "BA",
{^2017.01.01},{^2017.09.01})
INSERT INTO CTWC( clcode, wccode, validfr, validto) VALUES ("DB", "BC",
{^2017.01.01},{^2017.02.01})
INSERT INTO CTWC( clcode, wccode, validfr, validto) VALUES ("DC", "BD",
{^2017.01.01},{^2017.05.01})

and the full syntax

select *;
    from cwkt;
    where;
    funccode="TW" And trndate>={^2017.07.01} And;
    exists;
    (;
    select .T. From ctwc;
    where;
    cwkt.clcode=ctwc.clcode And cwkt.wccode=ctwc.wccode And;
    BETWEEN(cwkt.trndate, ctwc.validfr, ctwc.validto);
    );
    order By funccode, trndate, clcode, wccode, wonbr Into Cursor temp

errors: SQL - error correlating fields.

the syntax:

select *;
    from cwkt;
    where;
    funccode="TW" And trndate>={^2017.07.01} And;
    exists;
    (;
    select .T. ;
    From ctwc;
    where;
    cwkt.clcode=ctwc.clcode And cwkt.wccode=ctwc.wccode And;
    cwkt.trndate<ctwc.validto AND cwkt.trndate>validfr;
    );
    order By funccode, trndate, clcode, wccode, wonbr Into Cursor temp gives a 
result


Koen

2017-08-08 15:20 GMT+02:00 Ted Roche <tedro...@gmail.com>:

> I think this is referring to something different: a query in the FROM 
> clause is different from a query in the WHERE clause. In the FROM 
> clause, you're using the SQL to create an artificial data source, a 
> "Derived Table" in VFP terms. In the WHERE clause, you're filtering 
> the data in the SELECT portion against a set of tests, which could 
> include running a query and testing it against the source records for 
> matching.
>
[excessive quoting removed by server]

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