mysql column values add up to null

Others 2020-04-18 18:33:20 views: null

Sometimes there will be a case where the columns behind the select are added. When one of the values is empty, it returns directly. In such a case, ifnull is added

SELECT

ifnull(
SUM(
dispatch_fee + fuel_fee + road_fee
),
0
)
FROM
t_busi_station_exc

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