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[英]Selecting values from two columns and concatenating them into a column on the same table within two date
[英]Concatenating 2 columns in the same table
在下面的尝试中,我尝试连接同一张表中的两列,并在尝试运行它时显示“无效数目的参数”。
SELECT Concat(b.OB,',',C.OB) AS LANE
,(
CASE
WHEN a.vehicle_class LIKE '601%'
THEN 'Small'
WHEN a.vehicle_class LIKE '602%'
THEN 'Large'
WHEN a.vehicle_class LIKE '9%'
THEN 'TOW'
ELSE 'ERROR'
END) AS vehicle_size
, a.*
FROM
(SELECT *
FROM reserved
) a
, location b
, location c
, mre_system_parameters SYS
WHERE b.ob_location_id = a.ob_location_id
AND c.ob_location_id = a.ib_location_id
AND rental_date > sys.cpd - 20000
AND rental_date <= sys.cpd
AND a.vehicle_class LIKE '6%'
AND booking_count = 1;
COMMIT;
Oracle的concat
严格接受两个参数,而不是查询中的三个参数。 您可以只使用一系列串联运算符( ||
)代替:
b.OB || ',' || C.OB AS LANE
在oracle中,使用||
更方便。 串联运算符。 从而,
b.OB || ',' || C.O
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