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SQLize.online is a free online SQL environment for quickly running, experimenting with and sharing code.
You can run your SQL code on top of the most popular RDBMS including MySQL, MariaDB, SQLite, PostgreSQL, Oracle and Microsoft SQL Server.
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CREATE TABLE Bahnstation ( Name VARCHAR(30), Barrierefrei BOOLEAN, Unterirdisch BOOLEAN, Toiletten INTEGER, PRIMARY KEY (Name) CHECK(NOT Toiletten < 0) CHECK(LENGTH(Name) BETWEEN 3 AND 30) ); CREATE TABLE Fahrplan ( Fahrzeug CHAR(8), Minute INTEGER, Richtung VARCHAR(30), Station VARCHAR(30), PRIMARY KEY (Fahrzeug, Minute) FOREIGN KEY (Station) REFERENCES Bahnstation(Name) ON DELETE CASCADE FOREIGN KEY (Richtung) REFERENCES Bahnstation(Richtung) ON UPDATE CASCADE FOREIGN KEY (Fahrzeug) REFERENCES Fahrzeug(Fahrzeug) ); CREATE TABLE Straßenbahn ( Linie INTEGER NOT NULL, Farbe VARCHAR(10) UNIQUE, Strecke VARCHAR, PRIMARY KEY (Linie) CHECK(Linie > 0) ); CREATE TABLE Fahrzeug ( Fahrzeug CHAR(8), Linie INTEGER, PRIMARY KEY (Fahrzeug) FOREIGN KEY (Linie) REFERENCES Straßenbahn(Linie) ON DELETE SET NULL CHECK(Linie > 0) CHECK(Fahrzeug LIKE "FN-__-__") CHECK(NOT((Fahrzeug LIKE "%R%") AND (Fahrzeug LIKE "%Q%"))) ); INSERT INTO Straßenbahn VALUES (1, 'Gelb', 'Luis-Floke'); INSERT INTO Straßenbahn VALUES (2, 'Rot', 'Jensus-Jan'); INSERT INTO Fahrzeug VALUES ('FN-12-34', 1); INSERT INTO Fahrzeug VALUES ('FN-ab-cd', 2); INSERT INTO Fahrplan VALUES('FN-12-34', 12, 'Floke', 'Luis'); INSERT INTO Fahrplan VALUES('FN-ab-cd', 13, 'Jensus', 'Jan'); INSERT INTO Fahrplan VALUES('FN-12-34', 13, 'Luis', 'Jensus'); INSERT INTO Fahrplan VALUES('FN-ab-cd', 12, 'Jan', 'Floke'); INSERT INTO Fahrplan VALUES('FN-12-34', 14, 'Hallo', 'Welt'); INSERT INTO Fahrplan VALUES('FN-12-34', 15, 'Hallo', 'Welt'); ALTER TABLE Fahrzeug ADD Baujahr INTEGER; ALTER TABLE Fahrzeug DROP Baujahr;
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