vault backup: 2023-10-27 19:03:01

WS2324/Datenbank/Unterricht/04. DDL und DML (24.10.2023)/Vorlesungsbeispiel.txt

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+describeINSERT INTO test VALUE kunde; 
+DROP TABLE test;
+CREATE TABLE test(
+id INTEGER Primary key, 
+begruessung CHAR(20)
+); 
+describe test;
+INSERT INTO test VALUES (1, 'Hallo ');
+SELECT * FROM test;1
+S (2, 'Du da ');
+SELECT * FROM test;
+UPDATE test 
+SET begruessung = 'Sehr geehrte'
+WHERE Id=2;
+Select * from test;
+ALTER TABLE test 
+modify begruessung CHAR(30);
+describe test;
+UPDATE test 
+SET begruessung = 'Sehr geehrte Damen und Herren'
+WHERE Id=2;
+SELECT * FROM test;
+DELETE FROM test 
+WHERE Id=1;
+SELECT * FROM test;
+-- -----------------------------------
+DROP TABLE test;
+CREATE TABLE test(
+id INTEGER Primary key, 
+begruessung CHAR(20)  NOT NULL
+); 
+INSERT INTO test (id) VALUES (1);
+INSERT INTO test (id, begruessung) VALUES (1, NULL);
+INSERT INTO test VALUES (1, NULL);
+INSERT INTO test ( begruessung, id) VALUES ('hallo', 1);
+select * from test