删除 CTE's in transaction 无法删除重复记录

Question

Postgresql 10.1

错误：重复键值违反唯一约束“doctorbilling_encounter_unique” DETAIL: Key (encounter_recid, uid)=(1, 39) 已经存在。

我在这里尝试执行以下操作：

-在父 common_procedure 表中，我希望将描述从“so is this”更改为“this is a test”。这很容易导致 common_procedure 表中的冲突，如果它导致两条记录具有相同的描述，因此第一个 CTE 旨在消除 common_procedure 表中的所有冲突。

-第一个 CTE 旨在删除 common_procedure 表中的任何冲突，并从被删除的记录以及被保留的记录中返回 UID。

-第二个 CTE 旨在将引用从（现已删除）common_procedure 记录移动到保留的 common_procedure 记录（好的）。

-最后的 Delete 旨在清除医生帐单表中产生的任何重复项。

这失败了！我所做的每一次尝试都会导致上述错误。似乎语句的删除方面总是发生在插入之前，因此表处于错误状态。

可以这样做吗？

感谢任何帮助或想法。

BEGIN;

    SET CONSTRAINTS ALL DEFERRED;

    UPDATE common_procedures cp
    SET description = 'this is a test'          
    WHERE cp.description ='so is this';   


    WITH _t(bad_uid, good_uid) AS (
        DELETE FROM
            common_procedures a
                USING common_procedures b
        WHERE
            a.recid > b.recid             
            AND a.description = b.description
        RETURNING a.uid, b.uid
    ),
    _t1 AS (
        UPDATE doctor_billing
        SET uid = _t.good_uid
        FROM _t
        WHERE uid = _t.bad_uid          
    )
DELETE FROM
        doctor_billing a
            USING doctor_billing b, _t
    WHERE
        a.recid > b.recid             
        AND a.uid = b.uid AND a.encounter_recid = b.encounter_recid AND a.uid = _t.good_uid;

COMMIT;

这里是表定义（非常简化）：

CREATE TABLE common_procedures
(
    uid integer NOT NULL,
    description text NOT NULL,
    CONSTRAINT common_procedures_description_key UNIQUE (description)
        DEFERRABLE,
    CONSTRAINT common_procedures_uid UNIQUE (uid)
)

CREATE TABLE doctor_billing
(
    encounter_recid integer NOT NULL,
    uid integer NOT NULL,
    CONSTRAINT doctorbilling_encounter_unique UNIQUE (encounter_recid, uid)
        DEFERRABLE,
    CONSTRAINT doctor_billing_procedure_fk FOREIGN KEY (uid)
        REFERENCES nova.common_procedures (uid) MATCH SIMPLE
        ON UPDATE CASCADE
        ON DELETE RESTRICT
        DEFERRABLE
)

Answer 1

呃。我相信答案已经发布在这里：https://stackoverflow.com/a/13807067/1547335 几年前。

简而言之，使用同一张表修改cte的两个数据不应该在同一个语句中一起使用。这是上述的工作版本（使用 PetaPoco @'s）。请注意，不同表的数据修改是同时进行的，但最终的Delete语句已被分离出来。

BEGIN;
                                            SET CONSTRAINTS ALL DEFERRED;

                                            UPDATE common_procedures cp
                                            SET description =UPPER(TRIM( @0 ))                  
                                            WHERE UPPER(TRIM(cp.description)) = UPPER(TRIM(@1));    

                                            WITH _t(bad_uid, good_uid) AS (
                                                DELETE FROM
                                                    common_procedures a
                                                        USING common_procedures b
                                                WHERE
                                                    a.recid > b.recid            
                                                    AND a.description = b.description
                                                RETURNING a.uid, b.uid
                                            ),
                                             _t2 AS (
                                                UPDATE doctor_billing
                                                SET uid = _t.good_uid
                                                FROM _t
                                                WHERE uid = _t.bad_uid
                                            ),
                                            _t3 AS (
                                                UPDATE nurse_billing
                                                SET uid = _t.good_uid
                                                FROM _t
                                                WHERE uid = _t.bad_uid
                                            )
                                            UPDATE orders
                                            SET uid = _t.good_uid
                                            FROM _t
                                            WHERE uid = _t.bad_uid;

                                        DELETE FROM
                                                doctor_billing a
                                                    USING doctor_billing b
                                            WHERE
                                                a.recid > b.recid             
                                                AND a.uid = b.uid AND a.encounter_recid = b.encounter_recid;

                                        COMMIT;