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Relational keys are used in SQL to uniquely identify a specific row in a table. Also, they help determine the relationship between different tables and columns in a relational database. We are well-versed in the various attributes used as keys in relational databases.
SQL injection is a popular attack vector used to execute malicious SQL statements. The concept is essential in ethical hacking and pen testing. It enables SQL programmers to identify the vulnerabilities of the database system that attackers can use to access sensitive information.
A structured block language used by developers to override the disadvantages of SQL. PL/SQL utilizes the power of procedural statements and SQL to improve decision making, iteration, and provide extensive error-checking. We can help you with your PL/SQL assignment.
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An SQL index uses a pointer to speed up the retrieval of rows. As a result, data in a relational database can be accessed faster. We know how to create and drop indexes using the INSERT and UPDATE statements without affecting the data.
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5 Essential Commands That Every SQL Student Should Know
- DDL: Data Definition Language comprises SQL commands that define the database schema. In simple terms, it describes the database schema and modifies database objects' structures. Common DDL commands include DROP, CREATE, TRUNCATE, and ALTER.
- DQL: Data Query Language consists of statements that perform queries on schema objects' data. The SELECT statement is a DQL command.
- DML: Data Manipulation Language modifies data present in the database. DELETE, INSERT, UPDATE, CALL, and LOCK are some of the DML commands.
- DCL: Data Control Language grants permission and rights to the database controls. DCL commands include GRANT and Revoke.
- TCL: Transaction Control Language deals with all database transactions. Some TCL commands include ROLLBACK, COMMIT, and SAVEPOINT.
We Have Access to the Popular SQL Databases Taught In Universities and Colleges
We possess a wealth of knowledge of all SQL databases. We are skilled in all relational databases. We can help you organize your data and query any of the following databases:
