如何在Netezza

Question

在Netezza中，未强制执行主键。线程How to overcome Netezza's lack of unique constraint/referential integrity enforcement?回答了如何写入存储过程来强制执行它。

在我们的案例中，我们不想使用存储过程强制执行它，因为它会破坏我们的加载。相反，我们每月检查一次数据库完整性以找到可能的重复项。我们需要一个脚本来帮助我们为所有表生成以下查询：

SELECT {PK1}, {PK2}, COUNT(*)
FROM {TABLENAME}
GROUP BY {PK1}, {PK2} HAVING COUNT(*)>1
LIMIT 100;

Answer 1

以下答案使用了我的另一篇文章https://stackoverflow.com/a/36989929/4266330

的知识

以下脚本将返回您想要的结果

SELECT 'SELECT '||GROUP_BY_COLS||', COUNT(*)'||CHR(13)||
       '  FROM '||SCHEMA||'.'||TABLENAME||CHR(13)||
       ' GROUP BY '||GROUP_BY_COLS||' HAVING COUNT(*)>1'||CHR(13)||
       ' LIMIT 100;'
  FROM (       
SELECT 
     R.SCHEMA  AS SCHEMA
    ,R.NAME    AS TABLENAME
    ,TOOLKIT.SQLEXT.REGEXP_REPLACE(TOOLKIT.SQLEXT.GROUP_CONCAT('@'||LPAD(K.CONSEQ, 4, '0')||'@'||K.ATTNAME, ', '),
                                   '@[0-9]{4}@', '') AS GROUP_BY_COLS
  FROM _V_RELATION_COLUMN R
  JOIN _V_RELATION_KEYDATA K
    ON (R.SCHEMA=K.SCHEMA
   AND R.NAME=K.RELATION
   AND R.ATTNAME=K.ATTNAME)
 WHERE K.CONTYPE='p'
 GROUP BY 1, 2 
 ) S;

示例结果：

    SELECT IDP_EFFECTIVE_DATE, ACCOUNT_ID, COUNT(*)
      FROM AAA.L1_ACCOUNTS
     GROUP BY IDP_EFFECTIVE_DATE, ACCOUNT_ID HAVING COUNT(*)>1
     LIMIT 100;
    SELECT DEAL_NUM, COUNT(*)
      FROM ABUHARI.L1_BMO16_BOOST_EXTRACT_TOR
     GROUP BY DEAL_NUM HAVING COUNT(*)>1
     LIMIT 100;
    SELECT IDP_WAREHOUSE_ID, IDP_AUDIT_ID, ACCOUNT_KEY, COUNT(*)
      FROM ACTIMIZE.L1_ACTIMIZE_US12_ACCOUNT
     GROUP BY IDP_WAREHOUSE_ID, IDP_AUDIT_ID, ACCOUNT_KEY HAVING COUNT(*)>1
     LIMIT 100;