Join to only the “latest” record with t-sql

Question

I\'ve got two tables. Table \"B\" has a one to many relationship with Table \"A\", which means that there will be many records in table \"B\" for one record in table \"A\".<

Answer 1

Try using this:

    BEGIN

DECLARE @TB1 AS TABLE (ID INT, NAME VARCHAR(30) )
DECLARE @TB2 AS TABLE (ID INT, ID_TB1 INT, PRICE DECIMAL(18,2))

INSERT INTO @TB1 (ID, NAME) VALUES (1, 'PRODUCT X')
INSERT INTO @TB1 (ID, NAME) VALUES (2, 'PRODUCT Y')

INSERT INTO @TB2 (ID, ID_TB1, PRICE) VALUES (1, 1, 3.99)
INSERT INTO @TB2 (ID, ID_TB1, PRICE) VALUES (2, 1, 4.99)
INSERT INTO @TB2 (ID, ID_TB1, PRICE) VALUES (3, 1, 5.99)

INSERT INTO @TB2 (ID, ID_TB1, PRICE) VALUES (1, 2, 0.99)
INSERT INTO @TB2 (ID, ID_TB1, PRICE) VALUES (2, 2, 1.99)
INSERT INTO @TB2 (ID, ID_TB1, PRICE) VALUES (3, 2, 2.99)


SELECT A.ID, A.NAME, B.PRICE
  FROM @TB1 A
  INNER JOIN @TB2 B ON A.ID = B.ID_TB1 AND B.ID = (SELECT MAX(ID) FROM @TB2 WHERE ID_TB1 = A.ID)


END