A database is a structured set of data stored electronically. The concept of a database was known to our ancestors even when there were no computers. However, creating and maintaining such databases was a very
Indexes. They're one of the most powerful and misunderstood aspects of SQL performance. In this post we'll look at the purpose of an index, how to create and choose choose your index type. Then finish with a discussion of how to decide what to index and
Selecting records from the last 24 hours in PostgreSQL How to kickstart PostgreSQL on Mac OS X How COUNT(DISTINCT [field]) works in Google BigQuery Dynamic grouping in SQL: mastering the CASE statement Create a copy of a database in PostgreSQL Mastering column exclusions in SQL queries...
You can create a new database with the help of the CREATE DATABASE command: To connect to a specific MySQL database and work with it, execute the USE database command and specify the name of the database you want to access: You can create a new table and then populate it with data...
details of how this is done are unimportant here). This is because the field classes aren’t necessary when you’re just creating and modifying attributes. Instead, they provide the machinery for converting between the attribute value and what is stored in the database or sent to theserializer...
Create a link to open a related page (ASP) You can create a link that opens a related page and that passes existing parameters to that page. The server behavior is only available when using the ASP server model. Before adding a Go To Related Page server behavior to a page, make sure ...
Host:The public IP address of your Base Database Service. Username:Set it tooracle. Use key file:Tick it off and select your private key file. Add a Local Port Forward:Tick it off. Create Database Connection In theConnectionspanel, click on theplusicon to create a new connectio...
To define asavepointin a transaction, use theSAVEPOINTcommand. The following statement creates the savepoint namedADD_EMP1in the current transaction: SAVEPOINT Add_emp1; If you create a second savepoint with the same identifier as an earlier savepoint, the earlier savepoint is erased. After creati...
BindRepositorysWithAttribute<AutoRepository1Attribute>(); //Bind database generation interface x.BindDbGeneratorType<IDbGenerator1>(); //Callback before binding insert x.BeforeInsert += entity => { if (entity is BaseEntity baseEntity) { baseEntity.CreateOn = DateTime.Now; } }; //Callback ...
In this blog post, we’ll show you how to use SQL*Plus and related utilities to single-sign-on to the Oracle Autonomous Database.