You can join n tables (all having single column primary keys) in an SQL statement by specifying a minimum of n-1 join conditions. The columns in the join condition should coincide with each other. If in case there are some differences, then there may be issues in joining the columns together.
If you want to perform EQUI JOIN, you can also use the keyword JOIN then follow that with ON so that the columns that you have chosen will be checked if they are equal with each other. If they are found to be equal, then they would be matched and mixed well.
You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement. You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions