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SQLite Union All
SQLite Union All with history, features, advantages, installation, commands, syntax, datatypes, operators, expressions, databases, table, crud operations, clauses, like, glob, limit, and clause, advance sqlite
SQLite Union All OperatorThe SQLite UNION ALL operator is used to combine the result of two or more SELECT statement without ignoring the duplicate rows. In SQLite UNION ALL, the resultant table also includes the duplicate values. Otherwise, the same rule applies as Union. Syntax: SELECT expression1, expression2, ... expression_n FROM tables [WHERE conditions] UNION ALL 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 ALL. SELECT ID FROM STUDENT UNION ALL SELECT ID FROM DEPARTMENT; Output: 
Example2: UNION ALL 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 ALL Clause: SELECT EMP_ID, NAME, DEPT FROM STUDENT INNER JOIN DEPARTMENT ON STUDENT.ID = DEPARTMENT.EMP_ID UNION ALL SELECT EMP_ID, NAME, DEPT FROM STUDENT LEFT OUTER JOIN DEPARTMENT ON STUDENT.ID = DEPARTMENT.EMP_ID; Output: 
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