mysql基础 GROUP_CONCAT()

SELECT
    GROUP_CONCAT(
    CONCAT_WS(
    '---',
    TRANSIT_PORT_EN,
IF
    ( TRANSIT_PORT_CODE IS NULL OR TRIM(TRANSIT_PORT_CODE) = '', '无', TRANSIT_PORT_CODE ),
IF
    ( TRANSIT_ROUTE_CODE IS NULL OR TRIM(TRANSIT_ROUTE_CODE) = '', '无', TRANSIT_ROUTE_CODE ),
IF
    ( TRANSIT_VESSEL IS NULL OR TRIM(TRANSIT_VESSEL) = '', '无', TRANSIT_VESSEL ),
IF
    ( TRANSIT_VOYAGE IS NULL OR TRIM(TRANSIT_VOYAGE) = '', '无', TRANSIT_VOYAGE ) 
    ) 
ORDER BY
    TRANSIT_SORT SEPARATOR '>>>' 
    ) 

---- 不必须要 加 group by