• Sample data setup:

    DROP TABLE #Table1

    CREATE TABLE #Table1 (id int, value int)

    INSERT INTO #Table1 (id, value) VALUES

    (1, 11),

    (2, 12),

    (3, 13),

    (4, 14)

    DROP TABLE #table2

    CREATE TABLE #table2 (id1 INT, value1 INT)

    INSERT INTO #table2 (id1, value1) VALUES

    (1, 21),

    (2, 22),

    (1, 31),

    (2, 32)

    “Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

    For fast, accurate and documented assistance in answering your questions, please read this article.
    Understanding and using APPLY, (I) and (II) Paul White
    Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden