Odd as it sounds, Cross join has some useful scenarios, for example you want to create a synthetic resultset. A join enables you to retrieve records from two (or more) logically related tables in a single result set. I have two tables that I am trying to join. One contains a list of customers, the other is a list of orders. I executed each script by doing a union all and below is the result for that. No Clause says that for joining of two or more tables there must be a foreign key or primary key constraint. Here are the syntax to do a Cartesian product for two tables: SELECT * FROM tableA, tableB; We can use the Cartesian product, union, and cross-product to join two tables without a common column. There are rules to follow when join tables. The 2nd table has the following columns:-Now my question is in Table 1, there is a sql_count columns where there are list of sql count script listed. As Kiran said above, the Cross join, aka Cartesian product, would be applicable in cases where the tables have no common attributes. In this example you get either the cartesian product of all rows in both tables, or no row at all, depending on the condition being met. However, if a column name appears in multiple tables, references to the column must be qualified by the table name using tbl_name.col_name syntax to specify which table you mean. Conceptually data in a RDBMS is stored in normalized forms. Atomicity of data is must to achieve normalized data set. Suppose a table mytbl1 contains columns a and b , and a table mytbl2 contains columns b and c . Table 1:-It has the following columns in the image. In our first example, we want to see all possible combinations of wines and main courses from our menu.There are at least two approaches to combining the wine and the main_course tables to get the result we need.. How to Combine two Tables Without a Common Column. JOIN clauses are used to return the rows of two or more queries using two or more tables that shares a meaningful relationship based on a common set of values. Note that in this case, customers table and suppliers table don't have a common column for JOIN operation, but that won't cause any problems as in the SQL query, we can use the JOIN keyword without the ON keyword. I am trying to formulate a query that will allow me to select all of the customers listed in the table customers who have at least one order in the table orders.However, I do not want to get duplicates for those customers who have multiple orders. Understanding JOINs in MySQL. Using the “FROM Table1, Table2” Syntax Short answer: No Long answer: I am assuming you are talking about relational databases when doing joins. When join two tables, the two tables are related by primary key column in one table and foreign key column in another table. Let’s see how we can combine these tables to get the results we want. 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