postgresql - 列的类型为timestamp，没有时区，但表达式的类型为character

我正在尝试在Redshift上实现SCD2时插入记录
但出现错误。

目标表的DDL为

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

简而言之，我正在尝试将20150901 16:34:02插入from_timestamp和39991231 11:11:11.000插入to_timestamp。

并得到
ERROR: 42804: column "from_timestamp" is of type timestamp without time zone but expression is of type character varying
任何人都可以建议如何解决此问题？

最佳答案

Postgres无法将20150901 16:34:02(您的输入)识别为有效的时间/日期格式，因此假定它是一个字符串。

请改用标准日期格式，最好是ISO-8601。 2015-09-01T16:34:02
SQLFiddle example

关于postgresql - 列的类型为timestamp，没有时区，但表达式的类型为character，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/32336651/