what is the difference between delete and truncate in mysql?
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Truncate removes all the rows from a table. Delete with a where clause can delete rows (as specified using where clause) from a table. Drop will delete a table from the database. Drop and Truncate are DDL commands, whereas DELETE is a DML command.
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DROP statement is a Data Definition Language(DDL) Command which is used to delete existing database objects. ... Unlike TRUNCATE which only deletes the data of the tables, the DROP command deletes the data of the table as well as removes the entire schema/structure of the table from the database.
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What is the difference between using "FORMAT" and "DELETE" There are two methods to erase the images that are stored in your memory card. Using the camera's menu to "format" removes all files and sets up the memory card for use in the camera. "Delete" on the other hand removes one image after another.
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Use the DELETE FROM statement to delete one or more rows from a table. Use the WHERE clause to specify which rows to be deleted. Use the RETURNING clause to return the deleted rows.
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Delete is more for technology, such as software. Eliminate sounds like a game show, and erase sounds like fixing a math homework error.
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Truncate reinitializes the identity by making changes in data definition therefore it is DDL, whereas Delete only delete the records from the table and doesn't make any changes in its Definition that's why it is DML.
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Delete and truncate both commands can be used to delete data of the table. Delete is a DML command whereas truncate is DDL command. Truncate can be used to delete the entire data of the table without maintaining the integrity of the table. On the other hand , delete statement can be used for deleting the specific data.
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EXISTS is used to determine if any values are returned or not. Whereas, IN can be used as a multiple OR operator. If the sub-query result is large, then EXISTS is faster than IN. Once the single positive condition is met in the EXISTS condition then the SQL Engine will stop the process.
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TRUNCATE removes all rows from a table. The operation cannot be rolled back and no triggers will be fired. ... DROP and TRUNCATE are DDL commands, whereas DELETE is a DML command. Therefore DELETE operations can be rolled back (undone), while DROP and TRUNCATE operations cannot be rolled back.
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['CREATE – is used to create the database or its objects (like table, index, function, views, store procedure and triggers).', 'DROP – is used to delete objects from the database.', 'ALTER-is used to alter the structure of the database.']
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If a limit count is given, no more than that many rows will be returned (but possibly less, if the query itself yields less rows). LIMIT ALL is the same as omitting the LIMIT clause. OFFSET says to skip that many rows before beginning to return rows.
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['SELECT – retrieve data from the a database.', 'INSERT – insert data into a table.', 'UPDATE – updates existing data within a table.', 'DELETE – deletes all records from a table, the space for the records remain.', 'MERGE – UPSERT operation (insert or update)', 'CALL – call a PL/SQL or Java subprogram.']
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In MySQL, transactions begin with the statement BEGIN WORK and end with either a COMMIT or a ROLLBACK statement. The SQL commands between the beginning and ending statements form the bulk of the transaction.
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SQL is a language which is used to operate your database whereas MySQL was one of the first open-source database available in the market. ... SQL is a Structured Query Language and MySQL is a RDBMS to store, retrieve, modify and administrate a database. SQL is a query language while MYSQL is a database software.
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The BEGIN and END blocks are mandatory in a function while the stored procedure do not require them if it is just one line. In a function, it is mandatory to use the RETURNS and RETURN arguments, whereas in a stored procedure is not necessary.
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Difference Between Backspace and Delete. here is a difference between the backspace and delete button? The Backspace button deletes the typed character to the left of the blinking insertion-point cursor. The Delete button removes the character to its right, which can also be handy when you're editing.
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remove() delete the matching element/object whereas del and pop removes the element at a specific index. del and pop deals with the index. The only difference between two is that- pop return deleted the value from the list and del does not return anything. ... Remove is the only one that searches object (not index).