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If you want precise control over query processing, you can declare an explicit cursor in the declarative part of any PL/SQL block, subprogram, or package.
You must declare an explicit cursor for queries that return more than one row.
You give the cursor a name and associate it with a specific query.
You can optionally declare a return type for the cursor, such as DECLARE my_emp_id NUMBER(6); -- variable for employee_id my_job_id VARCHAR2(10); -- variable for job_id my_sal NUMBER(8,2); -- variable for salary CURSOR c1 IS SELECT employee_id, job_id, salary FROM employees WHERE salary The cursor is not a PL/SQL variable: you cannot assign values to a cursor or use it in an expression.
Cursors and variables follow the same scoping rules.
Naming cursors after database tables is possible but not recommended.As the following example shows, you can initialize cursor parameters to default values.You can pass different numbers of actual parameters to a cursor, accepting or overriding the default values as you please.Each fetch retrieves the current row and advances the cursor to the next row in the result set.You can store each column in a separate variable, or store the entire row in a record that has the appropriate fields, usually declared using DECLARE v_jobid employees.job_id%TYPE; -- variable for job_id v_lastname employees.last_name%TYPE; -- variable for last_name CURSOR c1 IS SELECT last_name, job_id FROM employees WHERE REGEXP_LIKE (job_id, 'S[HT]_CLERK'); v_employees employees%ROWTYPE; -- record variable for row CURSOR c2 is SELECT * FROM employees WHERE REGEXP_LIKE (job_id, '[ACADFIMKSA]_M[ANGR]'); BEGIN OPEN c1; -- open the cursor before fetching LOOP FETCH c1 INTO v_lastname, v_jobid; -- fetches 2 columns into variables EXIT WHEN c1%NOTFOUND; DBMS_OUTPUT.%FOUND Attribute: Has a DML Statement Changed Rows?Tags: Adult Dating, affair dating, sex dating