1、下面的数据库语法中1,0代表什么意思？
SELECT
R.DEPT_CODE AS CODE,
1 AS INSIDE,
0 AS DISTANCE
FROM
T_MAP_EXP_DEPT_REGION R
WHERE
R.ACTIVE='Y'
AND R.Region_Audit_State='EFFECTED'
AND (to_number(#{lng}) between R.MIN_LONGITUDE and R.MAX_LONGITUDE)
AND (to_number(#{lat}) between R.MIN_LATITUDE and R.MAX_LATITUDE)
AND SDO_GEOM.RELATE(R.boundary_baidu, 'ANYINTERACT',
sdo_geometry(2001, 4326, sdo_point_type(#{lng},#{lat}, null), null,
null), 0.0005) = 'TRUE'
AND ROWNUM <![CDATA[<=]]> 5