left()函数只能截取左边几位字符,截取中间字符用SUBSTR()
SUBSTR(cExpression, nStartPosition [, nCharactersReturned])
dbf
update dbf1 set Field1=left(Field1,8)
foxpro
PROVIDER=MSDASQL;DRIVER={Microsoft Visual Foxpro Driver};SourceDB=%S;SourceType=DBF
不识别varchar,只有char
Provider=VFPOLEDB.1;
识别varchar类型