What is the assignment operator in PL SQL?

The assignment operator is simply the way PL/SQL sets the value of one variable to a given value. There is only one assignment operator, := . I’m not sure where you saw the others listed or used, but they are invalid. Notice how the = is used to compare the value of v_temperature (which is 98.6) to the value 99.

How do you return in PL SQL?

The function must contain a return statement. The RETURN clause specifies the data type you are going to return from the function. function-body contains the executable part. The AS keyword is used instead of the IS keyword for creating a standalone function.

What does := mean in Plsql?

:= is the assignment operator in PL/SQL (Oracle’s procedural extension to SQL). You use this to assign values to variables. If you just use = then this is checking for equality rather than assigning a value.

Which operator is used for declaring variables that refer to the database?

A %TYPE declaration can also include an initialization clause. The %TYPE attribute is particularly useful when declaring variables that refer to database columns.

Is as in PL SQL?

Answer: The PL/SQL language evolved such the the “IS” and “AS” operators are equivalent. Functionally the “IS” and “AS” syntax performs identical functions and can be used interchangeably. However, in SQL there is a subtle difference between “AS” and “IS”: SQL> create or replace view emp_view as select * from scott.

What is the purpose of using PL SQL?

Function. The purpose of a PL/SQL function is generally used to compute and return a single value. This returned value may be a single scalar value (such as a number, date or character string) or a single collection (such as a nested table or array).

Where do we use PL SQL?

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 does assignment operator mean in PL SQL?

The assignment operator is simply the way PL/SQL sets the value of one variable to a given value. If you want to compare a value use an equal sign, but if you want to assign a value to a variable, use the := assignment operator. Click to see full answer. Similarly one may ask, what does := mean in PL SQL?

When to assign a value to a variable in PL / SQL?

A PL/SQL variable previously declared within the current scope. By default, unless a variable is initialized in its declaration, it is initialized to NULL every time a block or subprogram is entered. Always assign a value to a variable before using that variable in an expression.

How does an assignment statement work in SQL?

An assignment statement sets the current value of a variable, field, parameter, or element. The statement consists of an assignment target followed by the assignment operator and an expression. When the statement is executed, the expression is evaluated and the resulting value is stored in the target.

When to use default or assignment in Oracle?

Use DEFAULT for variables that have a typical value. Use the assignment operator for variables (such as counters and accumulators) that have no typical value. So I guess internally is the same. Let’s take a look to the documentation of the latest Oracle release (12c R1) at the moment of writing.