如果你只需要检查是否有已EMPNO超过100个的纪录,你可以使用例如EXISTS
声明
DECLARE
CURSOR c1 IS
SELECT
CASE
WHEN EXISTS (
SELECT
1
FROM
employees
WHERE
empno > 100
) THEN 1
ELSE 0
END AS empno_exists
FROM
dual;
ln_empno_exists PLS_INTEGER;
BEGIN
OPEN c1;
FETCH c1 INTO ln_empno_exists;
CLOSE c1;
DBMS_OUTPUT.PUT_LINE('Empno over 100 exists: '||CASE WHEN ln_empno_exists = 1 THEN 'TRUE' ELSE 'FALSE' END);
END;
/
编辑:如果你想用一些条件,以获取行,你只需要调整您的WHERE
子句中的SELECT
声明。这里有一些方法,通过记录提取到迭代的例子:
DECLARE
CURSOR c1 IS
SELECT
emp.*
FROM
employees emp
WHERE
empno > 100
;
lr_c1_rec c1%ROWTYPE;
BEGIN
-- Using FOR loop
DBMS_OUTPUT.PUT_LINE('START: Printing employees records where empno > 100');
FOR rec IN c1
LOOP
DBMS_OUTPUT.PUT_LINE('empno = '||rec.empno);
END LOOP;
DBMS_OUTPUT.PUT_LINE('END: Printing employees records where empno > 100');
-- Using a LOOP with EXIT clause
DBMS_OUTPUT.PUT_LINE('START: Printing employees records where empno > 100');
OPEN c1;
LOOP
FETCH c1 INTO lr_c1_rec;
-- exit the loop when your cursor doesn't have any more records to be returned
EXIT WHEN c1%NOTFOUND;
DBMS_OUTPUT.PUT_LINE('empno = '||lr_c1_rec.empno);
END LOOP;
DBMS_OUTPUT.PUT_LINE('END: Printing employees records where empno > 100');
-- Using WHILE loop
DBMS_OUTPUT.PUT_LINE('START: Printing employees records where empno > 100');
OPEN c1;
FETCH c1 INTO lr_c1_rec;
-- As long as cursor returns any values, iterate through the records returned
WHILE c1%FOUND
LOOP
DBMS_OUTPUT.PUT_LINE('empno = '||lr_c1_rec.empno);
END LOOP;
DBMS_OUTPUT.PUT_LINE('END: Printing employees records where empno > 100');
END;
/
能为您提供问题的详细资料?在这个公式中,你只需要执行一个SQL查询(不包括PL/SQL)在SQL * Plus为'从EMP选择*其中EMPNO> 100' – Dmitry