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SQL>
SQL> -- Use of the concatenation operator.
SQL> SET SERVEROUTPUT ON
SQL> DECLARE
2 a VARCHAR2(30);
3 b VARCHAR2(30);
4 c VARCHAR2(30);
5 BEGIN
6 -- Concatenate several string constants.
7 c := 'A' || ' AND ' || 'B';
8 DBMS_OUTPUT.PUT_LINE(c);
9 -- Concatenate both string variables and constants.
10 a := 'A';
11 b := 'B';
12 DBMS_OUTPUT.PUT_LINE(a || ' ' || b || ',');
13 -- Concatenate two string variables.
14 a := 'A ';
15 b := 'B';
16 c := a || b;
17 DBMS_OUTPUT.PUT_LINE(c);
18 END;
19 /
A AND B
A B,
A B
PL/SQL procedure successfully completed.
SQL>
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