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modul:m290:learningunits:lu07:theorie:04 [2024/09/30 13:12] – gelöscht vdemirmodul:m290:learningunits:lu07:theorie:04 [2024/10/17 13:49] (aktuell) vdemir
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 +====== LU08d - SQL-DML: DELETE ======
 +
 +**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 ====
 +^English ^ Deutsch ^
 +| ...| ... |
 +
 +----
 +[[https://creativecommons.org/licenses/by-nc-sa/4.0/|{{https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png}}]] Volkan Demir
  
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  • Zuletzt geändert: 2024/09/30 13:12
  • von vdemir