Can you explain insert update and DELETE query?
Can you explain insert update and DELETE query?
The SQL INSERT, UPDATE, and DELETE commands enable SQL users to manipulate and modify data: The INSERT statement introduces new rows into an existing table. The DELETE statement removes a row or combination of rows from a table. The UPDATE statement enables users to update a row or group of rows in a table.
How do I insert update DELETE?
INSERT , UPDATE , and DELETE are all functions in SQL that help you ensure your data is up-to-date and kept clear of unnecessary or outdated information. INSERT , UPDATE , and DELETE , as well as SELECT and MERGE, are known as Data Manipulation Language (DML) statements, which let SQL users view and manage data.
How does MySQL handle read consistency?
A consistent read means that InnoDB uses multi-versioning to present to a query a snapshot of the database at a point in time. The query sees the changes made by transactions that committed before that point in time, and no changes made by later or uncommitted transactions.
Who owns InnoDB?
Oracle Corporation
InnoDB became a product of Oracle Corporation after its acquisition of the Finland-based company Innobase in October 2005. The software is dual licensed; it is distributed under the GNU General Public License, but can also be licensed to parties wishing to combine InnoDB in proprietary software.
How do we DELETE update and select data in dataset?
Can you store multiple data types in System….
| Q. | How do we Delete, Update, Select data in a Dataset? |
|---|---|
| B. | Using SQLDataReader |
| C. | Using SQLComman |
| D. | D None |
| Answer» a. Using SQLDataAdapter |
How do we delete UPDATE and select data in dataset?
Which method is used for insert UPDATE and delete commands?
Associate the insert SQL command to the adapter. Then issue the ‘ExecuteNonQuery’ method. This is used to execute the Insert statement against our database. The ‘ExecuteNonQuery’ method is used in C# to issue any DML statements (insert, delete and update operation) against the database.
What is dirty read problem in DBMS?
A dirty read occurs when one transaction is permitted to read data that is being modified by another transaction that is running concurrently but which has not yet committed itself. If the transaction that modifies the data commits itself, the dirty read problem doesn’t occur.
What is Phantom read in MySQL?
The so-called phantom problem occurs within a transaction when the same query produces different sets of rows at different times. For example, if a SELECT is executed twice, but returns a row the second time that was not returned the first time, the row is a “phantom” row.