diff --git a/Scripts/DatasetMerging/SQL_Queries/db_creation.sql b/Scripts/DatasetMerging/SQL_Queries/db_creation.sql
index e3c2679..ca06e40 100644
--- a/Scripts/DatasetMerging/SQL_Queries/db_creation.sql
+++ b/Scripts/DatasetMerging/SQL_Queries/db_creation.sql
@@ -63,3 +63,41 @@ CREATE INDEX IF NOT EXISTS idx_rdf_subject_id ON RDFs(SubjectID);
 CREATE INDEX IF NOT EXISTS idx_rdf_relationship_id ON RDFs(RelationshipID);
 CREATE INDEX IF NOT EXISTS idx_rdf_object_id ON RDFs(ObjectID);
 
+CREATE TABLE IF NOT EXISTS Abbreviations (
+    AbbreviationID INTEGER PRIMARY KEY AUTOINCREMENT,
+    URI TEXT UNIQUE NOT NULL,
+    Abbreviation TEXT UNIQUE NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS Subjects_Abbreviations (
+    SubjectID INTEGER NOT NULL,
+    AbbreviationID INTEGER NOT NULL,
+    PRIMARY KEY(SubjectID, AbbreviationID),
+    FOREIGN KEY(SubjectID) REFERENCES Subjects(SubjectID),
+    FOREIGN KEY(AbbreviationID) REFERENCES Abbreviations(AbbreviationID)
+);
+
+CREATE TABLE IF NOT EXISTS Relationships_Abbreviations (
+    RelationshipID INTEGER NOT NULL,
+    AbbreviationID INTEGER NOT NULL,
+    PRIMARY KEY(RelationshipID, AbbreviationID),
+    FOREIGN KEY(RelationshipID) REFERENCES Relationships(RelationshipID),
+    FOREIGN KEY(AbbreviationID) REFERENCES Abbreviations(AbbreviationID)
+);
+
+CREATE TABLE IF NOT EXISTS Objects_Abbreviations (
+    ObjectID INTEGER NOT NULL,
+    AbbreviationID INTEGER NOT NULL,
+    PRIMARY KEY(ObjectID, AbbreviationID),
+    FOREIGN KEY(ObjectID) REFERENCES Objects(ObjectID),
+    FOREIGN KEY(AbbreviationID) REFERENCES Abbreviations(AbbreviationID)
+);
+
+CREATE INDEX IF NOT EXISTS idx_sub_abbr_sub_id ON Subjects_Abbreviations(SubjectID);
+CREATE INDEX IF NOT EXISTS idx_sub_abbr_abbr_id ON Subjects_Abbreviations(AbbreviationID);
+CREATE INDEX IF NOT EXISTS idx_rel_abbr_rel_id ON Relationships_Abbreviations(RelationshipID);
+CREATE INDEX IF NOT EXISTS idx_rel_abbr_abbr_id ON Relationships_Abbreviations(AbbreviationID);
+CREATE INDEX IF NOT EXISTS idx_obj_abbr_obj_id ON Objects_Abbreviations(ObjectID);
+CREATE INDEX IF NOT EXISTS idx_obj_abbr_abbr_id ON Objects_Abbreviations(AbbreviationID);
+
+
diff --git a/Scripts/DatasetMerging/SQL_Queries/query.sql b/Scripts/DatasetMerging/SQL_Queries/query.sql
index c2a0450..150afce 100644
--- a/Scripts/DatasetMerging/SQL_Queries/query.sql
+++ b/Scripts/DatasetMerging/SQL_Queries/query.sql
@@ -33,3 +33,13 @@ SELECT ObjectID FROM Objects WHERE ObjectURI = ?;
 
 
 INSERT INTO  RDFs (MovieID, SubjectID, RelationshipID, ObjectID) VALUES (?,?,?,?);
+
+-- Prefixes
+INSERT INTO Abbreviations(URI, Abbreviation) VALUES (?,?);
+INSERT INTO Objects_Abbreviations(ObjectID, AbrreviationID) VALUES (?,?);
+INSERT INTO Relationships_Abbreviations(RelationshipID, AbbreviationID) VALUES (?,?);
+INSERT INTO Subjects_Abbreviations(SubjectID, AbbreviationID) VALUES (?,?);
+
+-- Please be sure it is a URI before running this query
+--  and take at least until the domain and the first path part
+SELECT AbbreviationID FROM Abbreviations WHERE URI LIKE ?;