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 <[email protected]>:
> 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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