What is PL SQL explain in detail?
PL/SQL stands for “Procedural Language extensions to the Structured Query Language”. SQL is a popular language for both querying and updating data in the relational database management systems (RDBMS). PL/SQL is an embedded language. PL/SQL only can execute in an Oracle Database.
What is PL SQL and what is it used for?
PL/SQL lets you use all SQL data manipulation, cursor control, and transaction control statements, and all SQL functions, operators, and pseudocolumns. PL/SQL fully supports SQL data types. You need not convert between PL/SQL and SQL data types.
What are parts of PL SQL?
As Figure 1-1 shows, a PL/SQL block has three parts: a declarative part, an executable part, and an exception-handling part. (In PL/SQL, a warning or error condition is called an exception.) Only the executable part is required. The order of the parts is logical.
What are types in PL SQL?
PL/SQL has two kinds of data types: scalar and composite. The scalar types are types that store single values such as number, Boolean, character, and datetime whereas the composite types are types that store multiple values, for example, record and collection.
How many sections are there in PL SQL?
three sections
PL/SQL is a block-structured language whose code is organized into blocks. A PL/SQL block consists of three sections: declaration, executable, and exception-handling sections. In a block, the executable section is mandatory while the declaration and exception-handling sections are optional. A PL/SQL block has a name.
How many sections are there in PL SQL block?
A PL/SQL block has up to four different sections, only one of which is mandatory: Header. Used only for named blocks. The header determines the way the named block or program must be called.
What are bind variables in PL SQL?
Bind variables are variables you create in SQL*Plus and then reference in PL/SQL. If you create a bind variable in SQL*Plus, you can use the variable as you would a declared variable in your PL/SQL subprogram and then access the variable from SQL*Plus.
What are the two variables supported by PL SQL?
Variable Scope in PL/SQL: There are two types of variable scope: Local Variable: Local variables are the inner block variables which are not accessible to outer blocks. Global Variable: Global variables are declared in outermost block.
What are triggers in PL SQL?
A trigger is a pl/sql block structure which is fired when a DML statements like Insert, Delete, Update is executed on a database table. A trigger is triggered automatically when an associated DML statement is executed.
What is PL SQL procedure?
The PL/SQL stored procedure or simply a procedure is a PL/SQL block which performs one or more specific tasks. It is just like procedures in other programming languages. The procedure contains a header and a body.
What is PL SQL?
PL/SQL is an extension of SQL that allows developers to combine the power of SQL with procedural statements. Oracle Corporation developed it in the early ’90s.
What is PL SQL package?
PL/SQL package is a group of related functions, procedures, types, cursors, etc. PL/SQL package is like a library once written stored in the Oracle database and can be used by many applications.