When there is a parent-child relationship between the two parties, you can set cascade to all-delete-orphan at set.
The so-called parent-child relationship refers to the persistence cycle of the child controlled by the parent. The child object must be associated with a parent object. If a parent object is deleted, all associated child objects should be deleted ca
When there is a parent-child relationship between the two parties, you can set cascade to all-delete-orphan at set.
The so-called parent-child relationship refers to the persistence cycle of the child controlled by the parent. The child object must be associated with a parent object. If a parent object is deleted, all associated child objects should be deleted ca
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When there is a parent-child relationship between the two parties, you can set cascade to All-delete-orphan at set.The so-called parent-child relationship refers to the persisted shengming cycle of the parent's control, and the child object must be associated with a parent object. If you delete a parent object, you should cascade
Linux anti-select Delete file
The easiest way is to # shopt-s Extglob (open Extglob mode)# RM-FR! (File1)If you want to exclude multiple, you can do this:# RM-RF! (File1|file2) LINUXRM Delete Other file method totals outside the specified fileFirst, Linux delete files and folders Common commands are as follows: Delete
Original: The simplest way to delete all data in SQL ServerThe simplest Way to delete all data in SQL Server Author : CC Abba 2014-3-14 in fact, the method of deleting the data in the database is not complicated, why do I have to superfluous it, one is that I am here to delet
1. Cascade Delete:-Cascade Delete: Layoffs, company closures--Cascade Delete (Cascade), set to null (SETNULL), laissez-faire (no action) --Cascade: (Take one-to-many as an example) if you delete many of the parties, one party will not be affected, but if you delete a party,
[51CTO.com exclusive Article] In fact, it is not complicated to delete the data in the database. Why should I do this? First, I will introduce how to delete all the data in the database, because the data may form a constrained relationship between each other, the delete operation may be in an endless loop. Second, the
Bkjia.com exclusive Article] In fact, it is not complicated to delete the data in the database. Why should I do this? First, I will introduce how to delete all the data in the database, because the data may form a constrained relationship between each other, the delete operation may be in an endless loop. Second, the s
Command: Delete all-snapshots
Description: Deletes all snapshots associated with the specified volume. All data associated with the snapshot has been deleted and its space in the snapshot pool has been released for use. The specified volume can be either a primary volume or a snapshot pool.
I had to use the information below when I inadvertently relocated a VM from one ESX Server to another without first checking to see if it had snapshots. you see, if you ever move a VM with snapshots you will break the links between the vmdk and snapshotDelta files and will have to manually recreate them as described in the article below (information sourced fromHere ).VMware snapshots: Or, vmsd's, vmsn's, CID chains, and what happens when you press delete
Delete the object oracle --. SQL script-the only note is the following f: dropobj. SQL is the operation. SQL; -- your computer does not have a drive F, please replace it with D or E another drive letter -- used to delete all objects of the current user -- usefordropallobjectsincurrentuser; setheadingoff; setfeedback
Delete
Delete all rows in the table without recording the delete operation of a single row. The TRUNCATETABLE function is the same as the DELETE statement without a WHERE clause. However, the TRUNCATETABLE is faster and less system resources and transaction log resources are used.
Delete
Tags: style http color using data for AR DivSQL statement method to delete all records in a tableHow to delete all the records in a table with an SQL statement, share my method here.Reference Links:
How do SQL statements remove duplicate records? Four different methods
How do SQL statements remove duplicat
deleting files and directories in PHP is actually very simple as long as two functions one is unlink a rmdir function, if you want to implement delete directories and directories under the file we need to use the recursive operation.
Function code: Delete Only the files under the specified directory, not the directory folder.
The code is as follows
Copy Code
Class Shanchu {
(definition)The drop statement will delete the structure of the table that is dependent on the constraint (constrain), trigger (trigger), index (indexed); Stored procedures/functions that depend on the table are preserved, but become invalid states.The 2.delete statement is DML, which is placed in the rollback segement, which takes effect after the transaction is committed, and is triggered when the corres
deleting files and directories in PHP is actually very simple as long as two functions one is unlink a rmdir function, if you want to implement delete directories and directories under the file we need to use the recursive operation. This article mainly introduces the PHP Unlink and rmdir Delete directory and directory of all the file instance code, the need for
Ask for advice. However, you cannot delete the original folder. You can only delete files. But you cannot delete the original folder. You can only delete files.
Reply content:
Ask for advice. But you cannot delete the original folder. You can only
Truncate table
Delete all rows in the table without recording the delete operation of a single row.Syntax
Truncate tableNameParameters
Name
Is the name of the table to be truncated or the name of the table to delete all its rows.Note
The truncate table function is the s
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