1/17/2024 0 Comments Mysql union different column types![]() ![]() table employees_companyA table employees_companyB SELECT first_name, emp_category FROM employees_companyA In the below example, we have two tables carrying the data of two different companies A and B and we will be writing a union query to merge the data of a few columns from both to get the results. ![]() We were moving on to a real-world example now. See the UNION RESULTS in figure2, we got five records with duplicates removed, and row with data is the common data result set. ![]() figure2 PRO TIP : UNION clause adds the results vertically. Let’s say we have Table1 and Table2 with some data. Python - Access Nth item in List Of Tuplesīefore we look into the real-world example from MySQL workbench, let us focus on a small concept to make things clear. Python - Check if a value is in Dictionary Python - Returning Multiple Values in Function Check if all values in a Map are Equal in C++.C++ Map Contains() Function | C++20 Tutorial.Check if a Value exists in a Map in C++.In the following example we are retrieving all the values using the UNION ALL.Looking for Something Search for: Search Recent Posts Syntax of UNION ALL mysql> SELECT column_name FROM table_a We use the UNION ALL when we want to get all the values and not the distinct values. In the employeeaddress table we can see repetition of city name like Bangalore, Chennai and Kolkata, state name like KA, TN and WB.īut using the UNION in the query returns the city and state name only once as it is selecting only the unique i.e., distinct values. mysql>SELECT city, state, country FROM employeeaddress ![]() In the following example we are listing all the city, state and country name that are distinct in both the employeeadress and office tables. When using UNION in our query we will get distinct values from the tables. | 6 | e05 | PRIMARY | Apartment 10 | Fast Food Block | Chennai | TN | INDIA | 600000 | | 5 | e04 | PRIMARY | Fruits Apartment | Fresh Block | Bangalore | KA | INDIA | 560000 | | 4 | e02 | PRIMARY | Pizza Street | Foodies Block | Kolkata | WB | INDIA | 700000 | | 3 | e03 | SECONDARY | House #301 ABC Colony | Jupiter Block | Kolkata | WB | INDIA | 700000 | | 2 | e03 | PRIMARY | Super Housing Complex Block 22 | Major Street | Chennai | TN | INDIA | 600000 | | 1 | e01 | PRIMARY | #12 street | Action block | Bangalore | KA | INDIA | 560000 | | id | employeeid | addresstype | addressline1 | addressline2 | city | state | country | pincode | Table: employeeaddress mysql> SELECT * FROM employeeaddress | o03 | Game | #12 Super Street | Master Block | Chennai | TN | INDIA | 600000 | | o02 | Apps | #321 Super Street | Action Road | Kolkata | WB | INDIA | 700000 | | o01 | Web Projects | #123 Awesome Street | Super Main | Bangalore | KA | INDIA | 560000 | | officeid | officename | addressline1 | addressline2 | city | state | country | pincode | Table: office mysql> SELECT * FROM office In this tutorial we will be using the office and employeeaddress table. Where, column_name must be of same type and same order in both the SELECT statements. Syntax of UNION mysql> SELECT column_name FROM table_a The data types of the columns in the SELECT query must also match.The columns in the SELECT query must also be in the same order.Each SELECT query must have the same number of columns when using UNION.We use the UNION operator when we want to combine the results of multiple SELECT query.įollowing are the points to note when using UNION in a query. In this tutorial we will learn about union and union all in MySQL. ![]()
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