Microsoft has licensed or developed a variety of SQL variants. They’re all procedural languages that are used to manage relational database databases. However, they’re used in different ways. They were also created in different ways by different organizations. These are the differences between SQL and PL/SQL.
Regular Ole SQL
Let’s begin with plain vanilla SQL. The original. SQL stands for Structured Query Language and is the most commonly used language for managing and accessing data within a relational DBMS (database management software).
SQL was developed originally by IBM and is an ANSI/ISO Standard. There is also a dispute over how to pronounce it. It is a data-oriented language that allows you to specify the data structure and select and manipulate sets of data. It assumes that the data is stored in a relational database. The tables are made up of rows (tuples), and columns (fields containing particular types).
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Start training The DDL is used to define data structures and create objects such as views, tables, and procedures. DDL keywords include CREATE, ALTER, DROP, etc. DML can be used to access and modify data. DML keywords include SELECT, INSERT, UPDATE, MERGE, DELETE, etc.
SQL, on the other hand, aims to tell you what to do and not how to do it. SQL’s ideal is to describe the data structure (e.g. “CREATE TABLE …”),) and then describe what information you want to fetch (e.g. “SELECT fieldname FROM …”),) and let the DBMS software handle the low-level details about how to store and retrieve the data specified in your query.
This SQL purity has been gradually compromised. Real-world database systems quickly adopted the concept of stored procedures. These are chunks of server resident code that are written in a mixture of SQL statements and custom extensions and precompiled and stored within the database. Every DBMS uses its own dialect of SQL. These extensions are proprietary features that the vendor adds to the DBMS to make it easier to interact with it and make it more intuitive to do things that are difficult to do in pure declarative style.
The Powerful, But Lesser-Known Dialects of SQL
T-SQL, PL/SQL, and PL/SQL both are extensions of SQL: Extended subsets. Pure SQL is sufficient for create/read/update/delete (CRUD) operations but lacks the breadth of expressibility of a general-purpose language. Complex business rules and other routines that require the manipulation of data sets are difficult to code. Database vendors go beyond the norm by adding procedural mechanisms to certain SQL statements and extending their capabilities. They also provide built-in functions that allow for common capabilities such as strings, math, and accessing the internet.
T-SQL is a declarative language that can be used to specify and manipulate data. PL/SQL, on the other hand, is an imperative language that can be used to write apps. Both languages allow you to embed SQL statements in your database and store and execute their code. It is much easier to use SQL statements with T-SQL and PL/SQL than it is to invoke SQL facilities using ordinary general-purpose programming languages.
T-SQL: The SQL For Bankers
T-SQL (Transact SQL), is often associated with this.