Question

我必须查询表格以搜索给定的条件：

范围中指定的order_no必须存在。

示例：我收到一个order_no：003 - 007范围的请求。所以，我想检查范围内提到的所有order_no是否存在。如果不存在则返回false。
ALL order_no的order_status必须为1.如果不存在则返回false。

Order_string Order_no Order_status ABE 1 1 ABE 2 1 ABE 3 0 PSB 4 0 PSB 5 1 PSB 6 0 REL 7 0 REL 8 1 REL 9 1 REL 10 1

我正在尝试EXIST和BETWEEN但无法查询数据库。

Answer 1

您应该检查以下条件：

count(order_no) = count(distinct order_no) -- order_no are distinct in the range
and count(*) = end_val- start_vat+ 1 -- number of rows equals to size of the range
and bool_and(order_status::bool) -- all order_status are 1

如果列是唯一的，则不需要第一个条件。

您可以在函数中执行此操作：

create or replace function check_range(int, int)
returns boolean language sql as $$
    select 
        count(order_no) = count(distinct order_no)
        and count(*) = $2- $1+ 1
        and bool_and(order_status::bool)
    from my_table
    where order_no between $1 and $2;   
$$;

Answer 2

如果我理解你的问题是正确的，那么如果3 {7之间的ORDER_STATUS ORDER_NO中至少有一个是0，那么你想要错误

SELECT
CASE WHEN Z.SUM_STATUS > 0 THEN 'FALSE' ELSE 'TRUE' END AS RESULT
FROM    
    (SELECT
    SUM(CASE WHEN (ORDER_NO BETWEEN 3 AND 7) AND (ORDER_STATUS = 0) THEN 1 ELSE 0 END) AS SUM_STATUS
    FROM YOUR_TABLE) Z;

Answer 3

尝试：您可以使用此概念，如果它将返回1然后TRUE其他FALSE

SELECT 1 
FROM tmp t
WHERE Order_no BETWEEN 003 AND 007
    AND Order_status = 1
HAVING COUNT(*) = (007-003)+1

POSTGRES：SELECT：查询给定范围

3 个答案: