Question

我必须收集和存储有关我工作的许多事情的统计数据，特别是我突然在一张桌子上遇到问题。获取这些统计信息的过程的相关部分涉及将数据转储到临时表中，并将该表中的任何新数据插入主表中。所以我有这样的事情：

CREATE TABLE "TEMP_SCHEMA"."STATS_ORDERS"
(
  "ORDER_NO"      NUMBER(10,0)        NOT NULL ENABLE,
  "ORDER_DATE"    DATE                NOT NULL ENABLE,
  "ORDER_TYPE"    VARCHAR2(1 BYTE)    NOT NULL ENABLE
); /
GRANT SELECT,INSERT,UPDATE,DELETE
ON "TEMP_SCHEMA"."STATS_ORDERS" TO "MY_SCHEMA"; /

CREATE TABLE "MY_SCHEMA"."STATS_ORDERS"
(
  "ORDER_NO"      NUMBER(10,0)        NOT NULL ENABLE,
  "ORDER_DATE"    DATE                NOT NULL ENABLE,
  "ORDER_TYPE"    VARCHAR2(1 BYTE)    NOT NULL ENABLE,
  CONSTRAINT "PK_STATS_ORDERS" PRIMARY KEY ("ORDER_NO", "ORDER_TYPE")
); /

将数据转储到“TEMP_SCHEMA”。“STATS_ORDERS”我正在尝试这样的事情：

INSERT INTO MY_SCHEMA.STATS_ORDERS (ORDER_NO,ORDER_DATE,ORDER_TYPE)
SELECT
    DISTINCT TMP.ORDER_NO,TMP.ORDER_DATE,TMP.ORDER_TYPE
FROM
    (SELECT DISTINCT * FROM TEMP_SCHEMA.STATS_ORDERS) TMP
    LEFT JOIN MY_SCHEMA.STATS_ORDERS ORD
    ON TMP.ORDER_NO = ORD.ORDER_NO AND TMP.ORDER_TYPE = ORD.ORDER_TYPE
WHERE ORD.ORDER_NO IS NULL AND ORD.ORDER_TYPE IS NULL; /

当我运行它时，我收到以下错误：

SQL Error: ORA-00001: unique constraint (MY_SCHEMA.PK_STATS_ORDERS) violated
00001. 00000 -  "unique constraint (%s.%s) violated"
*Cause:    An UPDATE or INSERT statement attempted to insert a duplicate key.
          For Trusted Oracle configured in DBMS MAC mode, you may see
          this message if a duplicate entry exists at a different level.
*Action:   Either remove the unique restriction or do not insert the key.

我运行以下查询以查找导致错误的行：

SELECT ORDER_NO,ORDER_DATE,ORDER_TYPE
FROM
    MY_SCHEMA.STATS_ORDERS O
    INNER JOIN (
        SELECT DISTINCT TMP.ORDER_NO,TMP.ORDER_DATE,TMP.ORDER_TYPE
        FROM (SELECT DISTINCT * FROM TEMP_SCHEMA.STATS_ORDERS) TMP
          LEFT JOIN MY_SCHEMA.STATS_ORDERS ORD
          ON TMP.ORDER_NO = ORD.ORDER_NO AND TMP.ORDER_TYPE = ORD.ORDER_TYPE
        WHERE ORD.ORDER_NO IS NULL AND ORD.ORDER_TYPE IS NULL
    ) N
    ON O.ORDER_NO = N.ORDER_NO AND O.ORDER_TYPE = N.ORDER_TYPE; /

据推测，这应该返回导致违规的任何行，但当然它什么都不返回，因为我明确地排除了任何可能重复的行。

我做错了什么？

编辑：我不小心把原来的名字留给了我的例子。将其更改为我的示例中的名称。

Answer 1

识别有问题行的最简单方法通常是使用DML error logging。如果您创建错误表

BEGIN
  dmbs_errlog.create_error_log( dml_table_name => 'STATS_ORDERS',
                                err_log_table_name => 'STATS_ORDERS_ERR',
                                err_log_table_owner => 'MY_SCHEMA' );
END;

然后您可以在DML中使用LOG ERRORS INTO子句

INSERT INTO MY_SCHEMA.STATS_ORDERS (ORDER_NO,ORDER_DATE,ORDER_TYPE)
  SELECT DISTINCT TMP.ORDER_NO,TMP.ORDER_DATE,TMP.ORDER_TYPE
    FROM (SELECT DISTINCT * FROM TEMP_SCHEMA.STATS_ORDERS) TMP
         LEFT JOIN MY_SCHEMA.STATS_ORDERS ORD
         ON TMP.ORDER_NO = ORD.ORDER_NO AND TMP.ORDER_TYPE = ORD.ORDER_TYPE
   WHERE ORD.ORDER_NO IS NULL AND ORD.ORDER_TYPE IS NULL
     LOG ERRORS INTO stats_orders_err
  REJECT LIMIT UNLIMITED;

这会将约束拒绝的任何行写入stats_orders_err错误表。

Answer 2

确认您没有达到这种情况：

SQL> CREATE TABLE STATS_ORDERS_TMP
  2  (
  3    ORDER_NO      NUMBER(10,0)        NOT NULL ENABLE,
  4    ORDER_DATE    DATE                NOT NULL ENABLE,
  5    ORDER_TYPE    VARCHAR2(1 BYTE)    NOT NULL ENABLE
  6  );

Table created.

SQL>
SQL> CREATE TABLE STATS_ORDERS
  2  (
  3    ORDER_NO      NUMBER(10,0)        NOT NULL ENABLE,
  4    ORDER_DATE    DATE                NOT NULL ENABLE,
  5    ORDER_TYPE    VARCHAR2(1 BYTE)    NOT NULL ENABLE,
  6    CONSTRAINT PK_STATS_ORDERS PRIMARY KEY (ORDER_NO, ORDER_TYPE)
  7  );

Table created.

SQL> insert into STATS_ORDERS_TMP values (1, sysdate, 'A');

1 row created.

SQL> insert into STATS_ORDERS_TMP values (1, sysdate-1, 'A');

1 row created.

SQL> commit;

Commit complete.

SQL> insert into stats_orders (order_no,order_date,order_type)
  2  select
  3      distinct tmp.order_no,tmp.order_date,tmp.order_type
  4  from
  5      (select distinct * from stats_orders_tmp) tmp
  6      left join stats_orders ord
  7      on tmp.order_no = ord.order_no and tmp.order_type = ord.order_type
  8  where ord.order_no is null and ord.order_type is null;
insert into stats_orders (order_no,order_date,order_type)
*
ERROR at line 1:
ORA-00001: unique constraint (DTD_TRADE.PK_STATS_ORDERS) violated

即。您在“temp”表中有给定订单+类型的重复日期。

您的验证无法看到它们（因为它们不在主表中）：

SQL> SELECT o.ORDER_NO,o.ORDER_DATE,o.ORDER_TYPE
  2  FROM
  3      STATS_ORDERS O
  4      INNER JOIN (
  5          SELECT DISTINCT TMP.ORDER_NO,TMP.ORDER_DATE,TMP.ORDER_TYPE
  6          FROM (SELECT DISTINCT * FROM STATS_ORDERS_TMP) TMP
  7            LEFT JOIN STATS_ORDERS ORD
  8            ON TMP.ORDER_NO = ORD.ORDER_NO AND TMP.ORDER_TYPE = ORD.ORDER_TYPE
  9          WHERE ORD.ORDER_NO IS NULL AND ORD.ORDER_TYPE IS NULL
 10      ) N
 11      ON O.ORDER_NO = N.ORDER_NO AND O.ORDER_TYPE = N.ORDER_TYPE;

no rows selected

但确实存在：

SQL> select order_no, order_type, count(*) from stats_orders_tmp group by order_no, order_type having count(*) > 1;

  ORDER_NO O   COUNT(*)
---------- - ----------
         1 A          2

Oracle：对PK具有唯一的约束违规，具有可验证的唯一数据

2 个答案: