Sql 在同一个表上动态相交select查询_Sql_Postgresql

Sql 在同一个表上动态相交select查询

sql postgresql

Sql 在同一个表上动态相交select查询,sql,postgresql,Sql,Postgresql,将我的访问表设置为以下格式 ID access value 1 18 ab 1 32 bc 1 48 cd 2 18 ef 3 18 ab 3 32 bc 我需要根据输入获取所有能够访问特定号码的id 如果输入是[{access:18，value:ab}，{access:32，value:bc}] select id from access where access = 18 and value ='ab

将我的访问表设置为以下格式

ID  access value
1   18      ab
1   32      bc
1   48      cd
2   18      ef
3   18      ab  
3   32      bc

我需要根据输入获取所有能够访问特定号码的id

如果输入是

[{access:18，value:ab}，{access:32，value:bc}]

select id from access where access = 18 and value ='ab'
intersect
select id from access where access = 32 and value = 'bc'

产量为1,3

如果输入是

[{access:18，value:ab}，{access:32，value:bc}，{access:48，value:cd}]

select id from access where access = 18 and value ='ab'
intersect
select id from access where access = 32 and value ='bc'
intersect
select id from access where access = 48 and value ='cd'

输出为1

如何以更好的方式编写上述查询，以便基于输入我可以获得所需的结果。

您的方法很好。另一种方法是：

select id
from access
where access in (18, 32, 38)
group by id
having count(*) = 3;

你的方法很好。另一种方法是：

select id
from access
where access in (18, 32, 38)
group by id
having count(*) = 3;

我认为您正在以json数组的形式传递输入。您可以使用

json\u to\u记录集

将其转换为行，然后与

access

表进行联接，并将计数与

具有的

进行比较，以获得交点

PostgreSQL 9.6架构设置：

CREATE TABLE access
    (ID int, access int, value varchar(2))
;

INSERT INTO access
    (ID, access, value)
VALUES
    (1, 18, 'ab'),
    (1, 32, 'bc'),
    (1, 48, 'cd'),
    (2, 18, 'ef'),
    (3, 18, 'ab'),
    (3, 32, 'bc')
;

SELECT  ID
FROM access a
INNER JOIN (
    SELECT *, COUNT(*) OVER () as ct
    FROM json_to_recordset('[{"access":18,"value":"ab"},{"access":32, "value":"bc"}
                            ,{"access":48,"value":"cd"}
                            ]'
                          ) 
        AS j("access" INT, "value" TEXT)
    ) j ON (
        j.access = a.access
        AND j.value = a.value
        ) GROUP BY ID HAVING COUNT(*) = MAX(ct)

| id |
|----|
|  1 |

查询1：

CREATE TABLE access
    (ID int, access int, value varchar(2))
;

INSERT INTO access
    (ID, access, value)
VALUES
    (1, 18, 'ab'),
    (1, 32, 'bc'),
    (1, 48, 'cd'),
    (2, 18, 'ef'),
    (3, 18, 'ab'),
    (3, 32, 'bc')
;

SELECT  ID
FROM access a
INNER JOIN (
    SELECT *, COUNT(*) OVER () as ct
    FROM json_to_recordset('[{"access":18,"value":"ab"},{"access":32, "value":"bc"}
                            ,{"access":48,"value":"cd"}
                            ]'
                          ) 
        AS j("access" INT, "value" TEXT)
    ) j ON (
        j.access = a.access
        AND j.value = a.value
        ) GROUP BY ID HAVING COUNT(*) = MAX(ct)

| id |
|----|
|  1 |

：

CREATE TABLE access
    (ID int, access int, value varchar(2))
;

INSERT INTO access
    (ID, access, value)
VALUES
    (1, 18, 'ab'),
    (1, 32, 'bc'),
    (1, 48, 'cd'),
    (2, 18, 'ef'),
    (3, 18, 'ab'),
    (3, 32, 'bc')
;

SELECT  ID
FROM access a
INNER JOIN (
    SELECT *, COUNT(*) OVER () as ct
    FROM json_to_recordset('[{"access":18,"value":"ab"},{"access":32, "value":"bc"}
                            ,{"access":48,"value":"cd"}
                            ]'
                          ) 
        AS j("access" INT, "value" TEXT)
    ) j ON (
        j.access = a.access
        AND j.value = a.value
        ) GROUP BY ID HAVING COUNT(*) = MAX(ct)

| id |
|----|
|  1 |