Suppose a table mytbl1 contains columns a and b , and a table mytbl2 contains columns b and c . For join we need to satisfy the conditions using on or where clause as per our requirements. Odd as it sounds, Cross join has some useful scenarios, for example you want to create a synthetic resultset. One contains a list of customers, the other is a list of orders. A join enables you to retrieve records from two (or more) logically related tables in a single result set. How to Combine two Tables Without a Common Column. Yes we can. Understanding JOINs in MySQL. 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. Short answer: No Long answer: I am assuming you are talking about relational databases when doing joins. Conceptually data in a RDBMS is stored in normalized forms. 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. 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. Table 1:-It has the following columns in the image. There are two tables to be joined but there is no column column. We can use the Cartesian product, union, and cross-product to join two tables without a common column. Using the “FROM Table1, Table2” Syntax This can be achieved in MySQL by using a join without a common column.) Cartesian product means it matches all the rows of table A with all the rows of table B. 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. No Clause says that for joining of two or more tables there must be a foreign key or primary key constraint. As Kiran said above, the Cross join, aka Cartesian product, would be applicable in cases where the tables have no common attributes. There are rules to follow when join tables. Now, if you have a foreign key declared, joining on those linked columns is called a natural join an that is the most common scenario for a join… When join two tables, the two tables are related by primary key column in one table and foreign key column in another table. In the query below, we have two sub-queries in the FROM clause and each sub-query returns a single value. 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.. I have two tables that I am trying to join. Atomicity of data is must to achieve normalized data set. I executed each script by doing a union all and below is the result for that. 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. Here are the syntax to do a Cartesian product for two tables: SELECT * FROM tableA, tableB; 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. Let’s see how we can combine these tables to get the results we want. Useful scenarios, for example you want to create a synthetic resultset we want how to join two tables without common column in mysql, for example want. No clause says that for joining of two or more tables there must be a foreign key or primary column... List of customers, the other is a list of customers, two! 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