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SELECT-SQL command have different results in VFP8 and VF
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To
04/05/2005 14:46:29
General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Environment versions
Visual FoxPro:
VFP 9
OS:
Windows XP SP2
Network:
Windows 2000 Server
Database:
Visual FoxPro
Miscellaneous
Thread ID:
01010969
Message ID:
01010985
Views:
24
>SELECT-SQL command have different results in VFP8 and VFP9 Thread #1010955 Message #1010955

It looks like VFP9 bug to me. The query #1 should return only 3 records as in VFP8. Notice that field2 in the result is Null instead of blank for the records that shouldn't be included.
The query #2 correctly returns 3 records.
CREATE CURSOR taba ( ;
		ID C(4), ;
		field1 C(10), ;
		field2 C(1) ;
	)

CREATE CURSOR tabb ( ;
		ID C(6), ;
		field3 C(1) ;
	)

INSERT INTO taba VALUES( "0101",  "desc 1", "") 
INSERT INTO taba VALUES( "0201",  "desc 2", "X")

INSERT INTO tabb VALUES( "010101" ,"1")  
INSERT INTO tabb VALUES( "010102" ,"2")  
INSERT INTO tabb VALUES( "010103" ,"3")  
INSERT INTO tabb VALUES( "020101", "1")  
INSERT INTO tabb VALUES( "020102", "2")  
INSERT INTO tabb VALUES( "020103", "3") 

# 1
select * from tabb ;
	LEFT join taba on left(tabb.id,4)=taba.id ;
		WHERE not empty(taba.field2)
# 2
select * from tabb ;
	LEFT join taba on left(tabb.id,4)=taba.id ;
		WHERE EMPTY(taba.field2)
--sb--
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