qgis - Merge 2 SpatiaLite layers into one

I have a SpatiaLite database with some multipolygon layers loaded.

What I would like to do is to merge (not dissolve) 2 layers into 1. Both layers have the same SRID and same field name (they are a result of the same algorithm).

I'm looking for a SpatiaLite funcion that does the same thing of QGIS -> Union.

Is there a simple comand to do that?

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My solution, using @Alexandre's suggestions:

CREATE TABLE merged AS
SELECT * FROM layer1
UNION ALL
SELECT * FROM layer2;

SELECT RecoverGeometryColumn('merged', 'Geometry',  32632, 'MULTIPOLYGON', 'XY');

Answer

If you use DB Manager, you can use plain SQL to union two tables. Something like this:

SELECT field1, field2 FROM my_table_1
UNION ALL
SELECT field1, field2 FROM my_table_2

Notice that the fields must match in both tables in terms of data type, but they do not need to have the same name.