Check out example codes for "sql inner join sprcific columns". It will help you in understanding the concepts better.

Code Example 1

    t1.* -- All columns from table1
    t2.columnName -- Just that column from table2
    t3.columnName -- And just that column from table3

    table1 AS t1

    INNER JOIN table2 as t2
        ON = t2.table1_id

    INNER JOIN table3 AS t3
        ON = t3.table1_id

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