Data types of corresponding SELECT statement columns must be compatible, otherwise Vertica returns an error.

All rows of the UNION result set must be in the result set of at least one of its SELECT statements.Įach SELECT statement must specify the same number of columns. Result set column types are also determined as for UNION.

ALL concatenates all rows, including duplicates.

DISTINCT (default) returns only unique rows.

See also: ORDER BY, LIMIT, and OFFSET Clauses in UNION. A SELECT statement with one or more of these clauses must be enclosed by parentheses.

Each SELECT statement can specify its own ORDER BY, LIMIT, and OFFSET clauses.

Every SELECT statement within UNION must have the same number of columns. Vertica ignores LABEL hints in subsequent SELECT statements. The UNION operator is used to combine the result-set of two or more SELECT statements.

The first SELECT statement can include the hint LABEL.

Syntax select‑stmt UNION ]Ī SELECT statement that returns one or more rows, depending on whether you specify keywords DISTINCT or ALL. You can include UNION in FROM, WHERE, and HAVING clauses. Let us check the table records of new table.Combines the results of multiple SELECT statements.

Here is the query to create a new table from merging two tables with union mysql> create table UserTableDemo While using UNION clause, the following criteria must be. The query is as follows − mysql> select *from Old_TableDemo2 The MySQL UNION clause is used to combine the result-set of two or more SELECT statements. Please re-enable JavaScript in your browser settings. mm: Is a mm table that points to the next two tables using a tablenames field. MySQL: UNION Operator MySQL JavaScript is required for this website to work properly. Mysql> insert into Old_TableDemo2(UserName) values('Sam') ĭisplay all records from the second table using select statement. I have a problem with the correct syntax to use UNION and GROUPCONCAT in this situation: I have 4 tables: base: Is the main table with a lot of columns. The query is as follows − mysql> insert into Old_TableDemo2(UserName) values('Larry') Now you can insert some records in the second table using insert command. select sum (qty), name from ( select count (m.ownerid) as qty, o.name from transport t,owner o,motorbike m where t.type'motobike' and o.owneridm.ownerid and t.typeidm.motorbikeid group by m.ownerid union all select count (c.ownerid) as qty, o.name, from transport t,owner o,car c where t.type'car' and o.owneridc.ownerid. The query is as follows − mysql> select *from Old_TableDemo Mysql> insert into Old_TableDemo(UserName) values('Carol') ĭisplay all records from the first table using select statement. The query is as follows − mysql> insert into Old_TableDemo(UserName) values('John') Insert some records in the first table using insert command. The query to create second table is as follows mysql> create table Old_TableDemo2 > UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, The query to create first table is as follows mysql> create table Old_TableDemo To understand the above syntax, let us create a table. The following is the syntax to merge two tables using MySQL union create table yourTableName

Mysql union select syntax