,"The extract returns ",y }
}
DHC-APP>d ##class(PHA.TEST.SQLCommand).Extract()
The extract returns...$EXTRACT 与 Unicode
$EXTRACT函数对字符而不是字节进行操作。...,
$EXTRACT(:a,4,99),
$EXTRACT(:b,-33,4),
$EXTRACT(:b,4,4),
$EXTRACT(:b,4,99)
INTO...$EXTRACT(:a,3,2),
$EXTRACT(:a,-7,0),
$EXTRACT(:a,-7,-10),
$EXTRACT(:b,-33,4),
$EXTRACT...(:b,4,4),
$EXTRACT(:b,4,99),
$EXTRACT(NULL,-33,4),
$EXTRACT(NULL,4,4),
$EXTRACT(NULL,