# Pl Sql Assignment

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All these operators work on Boolean operands and produce Boolean results.

Let us assume variable A holds true and variable B holds false, then − Show Examples Operator precedence determines the grouping of terms in an expression. Certain operators have higher precedence than others; for example, the multiplication operator has higher precedence than the addition operator.

The variable 'var_mult' is declared in the inner block, so cannot be accessed in the outer block i.e. The variables 'var_num1' and 'var_num2' can be accessed anywhere in the block.

declare no1 number(3):=31; no2 number(3):=34; begin dbms_output.put_line('Before swap'); dbms_output.put_line('No1 : '||no1||' No2 : '||no2 ); -- no1:=(no1 no2)-(no2:=no1); generate error dbms_output.put_line('After swap'); dbms_output.put_line('No1 : '||no1||' No2 : '||no2 ); end; ed Wrote file 1 DECLARE 2 a number := 17; 3 b number := 42; 4 BEGIN 5 SELECT a, b 6 INTO b, a 7 FROM dual; 8 dbms_output.put_line( 'a = ' || a ); 9 dbms_output.put_line( 'b = ' || b ); 10* END; SQLdeclare no1 number(3):=31; no2 number(3):=34; begin dbms_output.put_line('Before swap'); dbms_output.put_line('No1 : '||no1||' No2 : '||no2 ); n1 := (n1 n2) - bitand(n1,n2) * 2; n2 := (n2 n1) - bitand(n2,n1) * 2; n1 := (n1 n2) - bitand(n1,n2) * 2; dbms_output.put_line('After swap'); dbms_output.put_line('No1 : '||no1||' No2 : '||no2 ); end; You cannot make multiple assignment operations in a single statement, so that will keep generating errors.

For example, x = 7 3 * 2; here, x is assigned 13, not 20 because operator * has higher precedence than , so it first gets multiplied with 3*2 and then adds into 7.

Here, operators with the highest precedence appear at the top of the table, those with the lowest appear at the bottom.

We can assign values to variables in the two ways given below. The General Syntax is: NOTE: The backward slash '/' in the above program indicates to execute the above PL/SQL Block.

PL/SQL allows the nesting of Blocks within Blocks i.e, the Execution section of an outer block can contain inner blocks.

Based on their declaration we can classify variables into two types.

For Example: In the below example we are creating two variables in the outer block and assigning thier product to the third variable created in the inner block.

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