Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- modul:m290:learningunits:lu07:theorie:04 [2024/09/30 10:45] – angelegt vdemir
+++ modul:m290:learningunits:lu07:theorie:04 [2024/10/17 13:49] (aktuell) – vdemir
@@ Zeile 1: / Zeile 1: @@
-====== LU07d - SQL-DML: DELETE ======
+====== LU08d - SQL-DML: DELETE ======
-===== Learning Objectives =====
+**Sources:**
-...
+  * [[https://www.w3schools.com/sql/sql_delete.asp | W3Schools | DELETE ]]
-  - ...
+===== 3. DELETE Statement =====
+The DELETE command is used to remove records from a table. Like UPDATE, it can be run with or without a filter, making it vital to define the condition to avoid unintended data removal.
+===== DELETE with Filter (WHERE Clause) =====
+Using a WHERE clause ensures that only specific rows matching the condition will be deleted.
+**Syntax:**
+  DELETE FROM table_name
+  WHERE condition;
+**Example**
+  DELETE FROM employees
+  WHERE employee_id = 1;
+===== DELETE without Filter =====
+Omitting the WHERE clause removes all data from the table, so it must be used cautiously. This operation doesn’t remove the table structure, just the rows.
+**Syntax:**
+  DELETE FROM table_name;
+**Example:**
+  DELETE FROM employees;
 ==== Vocabulary ====