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 di
The insert statement adds a new row or rows in a table in theOracle database. We generally use it after we have created a table in the database. One important point to remember is that while inserting records into a table, we must provide a value for every NOT NULL value. Let us lo...
Oracle GoldenGate - Version 12.1.2.0.2 and later: OGG: How to create UNIQUE index for OGG REPLICAT that is not used by DATABASE APPLICATION SQL
To group rows into part of a datetime value withOracle SQLyou can use thetruncfunction. This rounds down datetime values. The first argument is the datetime and the second is the units to round down to. For example, this groups the rows by hour: Copy code snippet Copied to Clipboard Erro...
I’ve always appreciated the CREATE OR REPLACE functionality in Oracle for views, packages and triggers, and I’ve often wanted a similar CREATE OR REPLACE TABLE. Many times, I’ll find myself needing to quickly drop and re-create a table while I’m designing it. ...
Steps for Connecting SQL Server and Oracle 1. Creating the mwrep User Perform the following actions to create a new database user: It should be noted that you can skip these steps if you already have a system orcl connection and a mwrep user. Step 1: Use the desktop icon to launch ...
MySQL derives part of its name from the SQL language, which is used for managing and querying data in databases. MySQL offers full ACID transactions and can handle a high volume of concurrent connections. MySQL Explained MySQL is an open source RDBMS that uses SQL to create and manage database...
Querying Data at a Point in Time (Flashback Query)Although some Oracle tools and applications simplify or mask the use of SQL, all database operations are performed using SQL, to take advantage of the security and data integrity features built into Oracle.Overview...
sql Inside the loop, we check if the product_active_status value for the current index is active. If so, we add it to the active_ids variable. We specify the index (inside the brackets) as the current count of the variable and add 1, essentially adding it as the next index. ...
Updated: Nov 2009 for SQL Developer 2.1 1. Introduction Oracle SQL Developer provides a SQL Worksheet that you can use to update data, by writing simple or complex SQL statements. In this How-To, we look at the most basic of these, inserting a record, updating single and multiple records...