Question

我有此查询（def autocomplete book = Book.search(params[:term], limit: 10).map(&:title) end属于artist_money类型，例如MONEY。）：

$30,456.11

当我试图得到结果时，这是错误：

SELECT SUM(
CASE
WHEN end_date - date '2015-12-3' <= 28 AND end_date - date '2015-12-3' > 0 THEN artist_money
END,
CASE
WHEN date '2015-12-3' - start_date > 28 THEN artist_money
END
) AS "gonorar"
FROM peacecard 
WHERE artist_id = 12345 AND contract IS NOT NULL

发生了什么事？根据{{3}}，ERROR: function sum(money, money) does not exist LINE 1: SELECT sum( ^ HINT: No function matches the given name and argument types. You might need to add explicit type casts. ********** Error **********应该采用参数SUM类型。

非常感谢！

Answer 1

问题是逗号，而不是钱类型。也许你打算：

SELECT SUM(CASE WHEN end_date - date '2015-12-3' <= 28 AND end_date - date '2015-12-03' > 0
                THEN artist_money
           END),
       SUM(CASE WHEN date '2015-12-3' - start_date > 28
                THEN artist_money
           END
          ) AS "gonorar"
FROM peacecard 
WHERE artist_id = 12345 AND contract IS NOT NULL;

或者，如果您想要一个列，那么仅使用一个case更有意义：

SELECT SUM(CASE WHEN end_date - date '2015-12-3' <= 28 AND end_date - date '2015-12-03' > 0
                THEN artist_money
                WHEN date '2015-12-3' - start_date > 28
                THEN artist_money
           END
          ) AS "gonorar"
FROM peacecard 
WHERE artist_id = 12345 AND contract IS NOT NULL;

Answer 2

您正尝试将两个参数传递给聚合1参数函数。

PSQL：聚合函数（总和）不起作用

2 个答案: