如何select oracle group中的所有列函数?
How to select all the columns in oracle group function?
我有一个table这样的
CREATE TABLE "FLIGHT"
( "CID" NUMBER NOT NULL ENABLE,
"FID" VARCHAR2(10 BYTE) NOT NULL ENABLE,
"SOURCE" VARCHAR2(20 BYTE) NOT NULL ENABLE,
"DESTINATION" VARCHAR2(20 BYTE) NOT NULL ENABLE
)
cid 是 customer_id 和
fid 是 flight_id
table
上的数据是这样的
我需要customer_id和每个客户的最后一搏
我得到了结果,但它并不完美
SELECT
*
FROM
flight a1
JOIN (
SELECT
cid,
MAX(fid) KEEP(DENSE_RANK FIRST ORDER BY fid DESC) AS flight
FROM
flight
GROUP BY
cid
) a2 ON a1.cid = a2.cid
AND a1.fid = a2.flight
输出:
我需要 table 中的所有列,但我得到了额外的列,例如 cid_1 和 flight .
如何从结果中删除这些额外的 2 列?
SELECT
a1.*
FROM
flight a1
JOIN (
SELECT
cid,
MAX(fid) KEEP(DENSE_RANK FIRST ORDER BY fid DESC) AS flight
FROM
flight
GROUP BY
cid
) a2 ON a1.cid = a2.cid
AND a1.fid = a2.flight
这应该可以解决您的问题
我有一个table这样的
CREATE TABLE "FLIGHT"
( "CID" NUMBER NOT NULL ENABLE,
"FID" VARCHAR2(10 BYTE) NOT NULL ENABLE,
"SOURCE" VARCHAR2(20 BYTE) NOT NULL ENABLE,
"DESTINATION" VARCHAR2(20 BYTE) NOT NULL ENABLE
)
cid 是 customer_id 和
fid 是 flight_id
table
上的数据是这样的我需要customer_id和每个客户的最后一搏
我得到了结果,但它并不完美
SELECT
*
FROM
flight a1
JOIN (
SELECT
cid,
MAX(fid) KEEP(DENSE_RANK FIRST ORDER BY fid DESC) AS flight
FROM
flight
GROUP BY
cid
) a2 ON a1.cid = a2.cid
AND a1.fid = a2.flight
输出:
我需要 table 中的所有列,但我得到了额外的列,例如 cid_1 和 flight .
如何从结果中删除这些额外的 2 列?
SELECT
a1.*
FROM
flight a1
JOIN (
SELECT
cid,
MAX(fid) KEEP(DENSE_RANK FIRST ORDER BY fid DESC) AS flight
FROM
flight
GROUP BY
cid
) a2 ON a1.cid = a2.cid
AND a1.fid = a2.flight
这应该可以解决您的问题