Shulou(Shulou.com)06/01 Report--

Today, what the editor shares with you is the introduction of the advantages and differences between SQL and PL / SQL. I believe many people don't know much about it. In order to make you understand better, I summed up the following contents and looked down together. I'm sure you'll get something.

What is SQL?

SQL (structured query language) is a standard database language for creating, maintaining and retrieving relational databases.

Advantages of SQL:

1. It is a high-level language with a greater degree of abstraction than process language.

2. It enables system personnel and end users to deal with many available database management systems.

3. Portability. This migration may be required when the underlying DBMS needs to be upgraded or changed.

4. SQL can be embedded in the syntax of many other languages, such as C / C + +, Java,Perl,Python,PHP and so on. It is a data-oriented declarative language.

What is PLSQL?

PLSQL is a block structured language, a database-oriented programming language, and a process language. It is an extension of SQL, it saves SQL statements in its syntax, and it extends SQL with procedural functionality.

Advantages of PL / SQL:

1. Block structure: it is made up of code blocks that can be nested within each other. Each block forms a unit of a task or logical module. PL / SQL blocks are usually retained in the information and reused.

2. Procedural language capability: it consists of procedural language constructs, such as conditional statements (if else statements) and loops (FOR loops).

3. Better performance: the PL / SQL engine processes multiple SQL statements at the same time with a block, thus reducing network traffic.

4. Error handling: PL / SQL effectively handles errors or exceptions during the execution of PL / SQL programs.

Main differences between SQL and PL / SQL

1. SQL executes a single query at a time or performs a single insert, update, or delete. Pl / SQL executes one block of code at a time to perform multiple select, insert, update, and delete operations.

2. SQL is a database structured query language. PL / SQL is a database programming language that uses SQL; it is used to write complete programs using variables, loops, operators, etc.

3. SQL is used to write queries, using DDL (data definition language) and DML (data manipulation language) statements; PL / SQL is used to write program blocks, whose syntax includes procedures, functions, triggers, packages, variables.

4. SQL query is used to retrieve data from the database; it can also perform operations such as add, delete, modify, etc. PL / SQL, on the other hand, is used to create applications that can display information retrieved by SQL.

5. SQL is a declarative language and can be embedded in PLSQL, while PLSQL is a procedural language that can be embedded in SQL.

6. SQL is data-oriented and can interact directly with the database server. PL / SQL is application-oriented and does not interact with the database server.

7. SQL does not support control structures; PL / SQL can use control structures, such as for loop, while loop

8. SQL is mainly used to manipulate data; PL / SQL is mainly used to create applications.

These are the details of the advantages and differences between SQL and PL / SQL. Is there anything to gain after reading it? If you want to know more about it, welcome to the industry information!

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