set exact on如何不起作用啊

set exact on怎么不起作用啊？
SET EXACT ON
create cursor T1 (NO C (20))
SELE T1
APPE BLANK
REPLACE NO WITH "123"
APPE BLANK
REPLACE NO WITH "1234"
APPE BLANK
REPLACE NO WITH "1235"
APPE BLANK
REPLACE NO WITH "1236"

SELECT * FROM T1 WHERE ALLT(NO)='123' INTO CURSOR T2

可以看到T2中有四条记录，我设置了SET EXACT ON，应该只有一条啊？

------解决方案--------------------------------------------------------
VFP Help: Unlike SET ANSI, SET EXACT does not apply to Visual FoxPro SQL commands. 

SET EXACT 对VFP的SQL命令无效。
------解决方案--------------------------------------------------------
sql 语句的比较规则与 set ansi 设置有关，应该先 set ansi on