SQLite 返回与另一个表中的特定记录集匹配的记录

Question

I have a table that has a one-to-many relationship to another table. I want the records from the first table that match a specific set in the second table.

CREATE TABLE A (aId INTEGER PRIMARY KEY);
CREATE TABLE B (bId INTEGER PRIMARY KEY, aId INTEGER, c INTEGER);

INSERT INTO A (aId) VALUES (1);
INSERT INTO A (aId) VALUES (2);

INSERT INTO B (bId, aId, c) VALUES (1, 1, 1);
INSERT INTO B (bId, aId, c) VALUES (2, 1, 2);
INSERT INTO B (bId, aId, c) VALUES (3, 2, 2);
INSERT INTO B (bId, aId, c) VALUES (4, 2, 3);

For example, I was aId Where c is 1 and 2. so aId = 1. I don't want it to return aId 2 because while it matches c = 2 it doesn't have c = 1.

SELECT aId FROM B WHERE c IN(1,2);

Gives me 1,1,2. Is there something similar that matches all elements rather than any?

Answer 1

If you know how many items are in the IN clause for C,

SELECT aID FROM B WHERE C IN(1,2) GROUP BY aID HAVING COUNT(*)=2;

where the COUNT(*) is equal to the number of elements in the IN . If the filter is more complicated, we'll need another approach.