我正在尝试在 Redshift 上实施 SCD2 时插入记录
但出现错误。
目标表的DDL是
CREATE TABLE ditemp.ts_scd2_test (
id INT
,md5 CHAR(32)
,record_id BIGINT IDENTITY
,from_timestamp TIMESTAMP
,to_timestamp TIMESTAMP
,file_id BIGINT
,party_id BIGINT
)
这是插入语句：
INSERT
INTO ditemp.TS_SCD2_TEST(id, md5, from_timestamp, to_timestamp)
SELECT TS_SCD2_TEST_STAGING.id
,TS_SCD2_TEST_STAGING.md5
,from_timestamp
,to_timestamp
FROM (
SELECT '20150901 16:34:02' AS from_timestamp
,CASE
WHEN last_record IS NULL
THEN '20150901 16:34:02'
ELSE '39991231 11:11:11.000'
END AS to_timestamp
,CASE
WHEN rownum != 1
AND atom.id IS NOT NULL
THEN 1
WHEN atom.id IS NULL
THEN 1
ELSE 0
END AS transfer
,stage.*
FROM (
SELECT id
FROM ditemp.TS_SCD2_TEST_STAGING
WHERE file_id = 2
GROUP BY id
HAVING count(*) > 1
) AS scd2_count_ge_1
INNER JOIN (
SELECT row_number() OVER (
PARTITION BY id ORDER BY record_id
) AS rownum
,stage.*
FROM ditemp.TS_SCD2_TEST_STAGING AS stage
WHERE file_id IN (2)
) AS stage
ON (scd2_count_ge_1.id = stage.id)
LEFT JOIN (
SELECT max(rownum) AS last_record
,id
FROM (
SELECT row_number() OVER (
PARTITION BY id ORDER BY record_id
) AS rownum
,stage.*
FROM ditemp.TS_SCD2_TEST_STAGING AS stage
)
GROUP BY id
) AS last_record
ON (
stage.id = last_record.id
AND stage.rownum = last_record.last_record
)
LEFT JOIN ditemp.TS_SCD2_TEST AS atom
ON (
stage.id = atom.id
AND stage.md5 = atom.md5
AND atom.to_timestamp > '20150901 16:34:02'
)
) AS TS_SCD2_TEST_STAGING
WHERE transfer = 1
为了简短起见，我正在尝试插入20150901 16:34:02 to from_timestamp and 39991231 11:11:11.000 to to_timestamp.
and get
ERROR: 42804: column "from_timestamp" is of type timestamp without time zone but expression is of type character varying
谁能建议如何解决这个问题？
