Question

我正在尝试迭代函数内部的临时表，我希望在每一行都进行更新。

临时表应该包含从查询中获取的所有用户ID。之后，如果具有属性的交易百分比小于所有交易的50％，则应检查每个单个用户。

最后，应更新帐户字段master_segments。

我的代码看起来像这样：

CREATE OR REPLACE FUNCTION temptable()
RETURNS VARCHAR
AS $$
BEGIN

  CREATE TEMP TABLE IF NOT EXISTS testTable AS
    SELECT account.sfid, transactions.transactionNumber
    FROM account
      INNER JOIN transactions ON account.sfid =transactions.accountsfid
      INNER JOIN transactionLineItems ON transactions.transactionNumber = transactionLineItems.transactionNumber
      INNER JOIN products ON transactionLineItems.USIM = products.USIM
        WHERE account.gender = '1' AND (transactions.transactionDate  >= current_date - interval '730' day AND products.gender = 'female' AND products.agegroup = 'adult'); 

    FOR j IN testTable.sfid LOOP
    SELECT(
          (SELECT COUNT(transactions.transactionNumber)
           FROM transactions
           INNER JOIN account ON account.sfid = transactions.accountsfid
           INNER JOIN transactionLineItems ON transactions.transactionNumber = transactionLineItems.transactionNumber
           INNER JOIN products ON transactionLineItems.USIM = products.USIM
           WHERE products.gender = 'male' AND products.agegroup = 'adult' AND transactions.transactionDate >= current_date - interval '730' day)*1.0 /
           (SELECT COUNT(transactions.transactionNumber)
           FROM transactions
           WHERE transactions.transactionDate >= current_date - interval '730' day)
         ) < 0.5;

         UPDATE account 
         SET account.master_segments = 'Women' WHERE account.sfid = testTable.sfid;
    END LOOP;
END;
$$ LANGUAGE plpgsql;

我收到此消息：

ERROR: syntax error at or near "testTable" LINE 14: FOR j IN testTable.sfid LOOP

有人对此有建议吗？谢谢！

Answer 1

我假设你尝试做的是：

UPDATE account 
         SET account.master_segments = 'Women' 
FROM (
    SELECT account.sfid, transactions.transactionNumber
    FROM account
      INNER JOIN transactions ON account.sfid =transactions.accountsfid
      INNER JOIN transactionLineItems ON transactions.transactionNumber = transactionLineItems.transactionNumber
      INNER JOIN products ON transactionLineItems.USIM = products.USIM
        WHERE account.gender = '1' AND (transactions.transactionDate  >= current_date - interval '730' day AND products.gender = 'female' AND products.agegroup = 'adult')
) testtable
WHERE account.sfid = testtable.sfid

Answer 2

您不需要子查询，也不需要为此逻辑重复account表：

UPDATE account a
     SET master_segments = 'Women' 
FROM transactions t INNER JOIN
     transactionLineItems tli
     ON t.transactionNumber = tli.transactionNumber AND
        t.transactionDate  >= current_date - interval '730' day INNER JOIN
     products p
     ON tli.USIM = p.USIM AND
        p.gender = 'female' AND
        p.agegroup = 'adult'
WHERE a.gender = '1' AND a.sfid = t.sfid;

我还引入了表别名，因此查询更容易编写和阅读。

通过PostgreSQL中的临时表迭代For循环

2 个答案: