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Structured Query Language (SQL) is a standard database language used to create, maintain and retrieve relational databases.
The advantages of SQL are:
SQL can be a high-level language, which has a greater degree of abstraction than a programming language.
It enables system personnel and end users to work with the many database management systems available.
portability. This type of migration may be required when the underlying DBMS needs to be upgraded or changed.
SQL specifies what is required, but it should not be done.
PL/SQL is a block-structured language that enables developers to combine the power of SQL with procedural statements. All statements of the block are passed to the Oracle engine at once, thereby increasing processing speed and reducing traffic. PL/SQL stands for "Procedural Language Extensions to SQL."
PL/SQL is a database-oriented programming language that extends SQL with procedural functionality. It was developed by Oracle Corporation in the early 1990s to improve the functionality of SQL.
PL/SQL adds selectivity (i.e. if...then...else...) and iteration structures (i.e. loops) to SQL. PL/SQL is most helpful for writing triggers and preserving procedures. The stored procedure square measurement unit of program code is preserved during compilation within the message. The advantages of PL/SQL are as follows:
Block structure: It consists of code blocks and they can be nested within each other. Each block forms a unit of task or logical module. PL/SQL blocks are usually kept in the message and reused.
Procedural language capabilities: It consists of procedural language constructs such as conditional statements (if else statements) and loops (FOR loops).
Better performance: The PL/SQL engine can process multiple SQL statements simultaneously as a block, thus reducing network traffic.
Error Handling: PL/SQL handles errors or exceptions efficiently during the execution of a PL/SQL program.
Once a correlation exception is caught, specific actions can be taken based on the type of exception, or it can be displayed to the user through a message.
The difference between SQL and PLSQL:
| SQL | PLSQL |
| It is a database structured query language. | It is a database programming language using SQL. |
| Data variable is not available | Data variable is available. |
| No supported control structure. | Control Structures are available, For loop, While loop. |
| Query performs a single operation. | PLSQL block executes a single Block operation group. |
| SQL is a declarative language. | PLSQL is a programming language. |
| SQL can be embedded in PLSQL. | PLSQL can be embedded in SQL. |
| It interacts directly with the database server. | It does not interact with the database server. |
| It is a data-oriented language. | It is an application-oriented language. |
| It is used for writing queries, DDL and DML statements. | It is used to write program blocks, functions, procedure triggers and packages. |
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