Summary of basic introductory tutorials for deleting table data

MySQL delete table data There are two methods to delete data in MySQL, one is the DELETE statement and the other is the TRUNCATE TABLE statement. The DELETE statement can select records to be deleted through WHERE. Using TRUNCATE TABLE will delete all records in the table. Therefore, DELETE statement is more flexible. If you want to clear all records in the table, you can use the following two methods: DELETE FROM table1 TRUNCATE TABLE table1 The TABLE in the second record is optional. If you want to delete the data in the table

1. mysql advanced (21) deleting table data

Introduction: There are two methods to delete data in MySQL, one is the DELETE statement and the other is the TRUNCATE TABLE statement. The DELETE statement can select records to be deleted through WHERE. Using TRUNCATE TABLE will delete all records in the table. Therefore, DELETE statement is more flexible.

2. The difference between sql deleting table data truncate delete drop

Introduction: sql deleting table data truncate delete drop The differences are reproduced below: For learning purposes 1. truncate, delete without where clause, and drop will all delete the data in the table. 2. Drop and truncate are both DDL statements (data definition language), which will be automatically submitted after execution. Differences: 1. truncate and delete only delete data but not

3. Oracle’s quick recovery function after accidentally deleting table data

Introduction: 1. Query and modify the undo_retention parameter: Use the show parameter undo; command to view the current database parameter undo_retention setting. The display is as follows: undo_

4. Detailed explanation of Oracle’s recovery after accidentally deleting table data

##Introduction: 1. undo_retention Parameter query and modification: Use the show parameter undo; command to view the current database parameter undo_retention setting. The display is as follows: undo_man

5. Analysis of the impact on performance when Delete deletes table data

Introduction: When we When using delete to delete data, because the high water level cannot be lowered, database performance problems will occur when performing a full table scan on the table. Truncate can greatly improve this situation, as follows

6. Usage of drop, truncate and delete to delete table data in sql statement

##Introduction: Although green The editor of Resource Network does not recommend that you use commands to delete things in database tables, but these deletion commands are always useful. When it comes to the keywords for deleting table data, the most remembered one may be delete. However, we do database development and read database data. The other two brothers are less used. Now let’s introduce the other two brothers, both are

7.

mysql-Mysql uses stored procedures to delete table data

Introduction: I now have two tables A , B, the two tables are related by foreign keys. Now I want to use the storage structure of mysql to delete the data of table A (associated with table B). How to write it

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