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SQLite Union
SQLite Union with history, features, advantages, installation, commands, syntax, datatypes, operators, expressions, databases, table, crud operations, clauses, like, glob, limit, and clause, advance sqlite
SQLite Union OperatorSQLite UNION Operator is used to combine the result set of two or more tables using SELECT statement. The UNION operator shows only the unique rows and removes duplicate rows. While using UNION operator, each SELECT statement must have the same number of fields in the result set. Syntax: SELECT expression1, expression2, ... expression_n FROM tables [WHERE conditions] UNION SELECT expression1, expression2, ... expression_n FROM tables [WHERE conditions]; Example: We have two tables "STUDENT" and "DEPARTMENT". 
The "STUDENT" table is having the following data: 
The "DEPARTMENT" table is having the following data: 
Example1: Return Single Field This simple example returns only one field from multiple SELECT statements where the both fields have same data type. Let's take the above two tables "STUDENT" and "DEPARTMENT" and select id from both table to make UNION. SELECT ID FROM STUDENT UNION SELECT ID FROM DEPARTMENT; Output: 
Example2: Union with Inner and Outer Join Let's take the above two tables "STUDENT" and "DEPARTMENT" and make an inner join and outer join according to the below conditions along with UNION Clause: SELECT EMP_ID, NAME, DEPT FROM STUDENT JOIN DEPARTMENT ON STUDENT.ID = DEPARTMENT.EMP_ID UNION SELECT EMP_ID, NAME, DEPT FROM STUDENT LEFT OUTER JOIN DEPARTMENT ON STUDENT.ID = DEPARTMENT.EMP_ID; Output: 
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