[英]how to Compare two tables that contain millions of entries but different in columns
我有两张桌子。 一列包含三列,第二列包含更多列,我希望两个表之间的对应值成为包含最多列的表的对应值。
请注意,我尝试使用此代码,但值均为null谢谢。
SELECT
plate_lable.numbers,
plate_lable.governorate,
plate_lable.usage,
TO_CHAR(NULL) "chassis",
TO_CHAR(NULL) "brand",
TO_CHAR(NULL) "vehicle_production_year",
TO_CHAR(NULL) "DATES",
TO_CHAR(NULL) "use_case"
FROM
plate_lable
INTERSECT
SELECT
t_registered_unit.numbers AS numbers,
t_registered_unit.governorate AS governorate,
t_registered_unit.usage AS usage,
t_registered_unit.chassis as chassis,
t_registered_unit.brand as brand,
t_registered_unit.vehicle_production_year as vehicle_production_year,
TO_CHAR(CAST(t_registered_unit.CREATED AS DATE), 'YYYY\MM\dd') AS DATES,
t_registered_unit.use_case as use_case
FROM
t_registered_unit
SELECT
t1.numbers,
t1.governorate,
t1.usage,
t2.chassis as chassis,
t2.brand as brand,
t2.vehicle_production_year as vehicle_production_year,
TO_CHAR(CAST(t2.CREATED AS DATE), 'YYYY\MM\dd') AS DATES,
t2.use_case as use_case
FROM
plate_lable t1
inner join t_registered_unit t2
ON
t1.numbers = t2.numbers and
t1.governorate = t2.governorate and
t1.usage = t2.usage ;
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