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59 lines
1.5 KiB
Plaintext
59 lines
1.5 KiB
Plaintext
SET sql_mode=ORACLE;
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create aggregate function f1(x INT) return INT AS
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begin
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insert into t1(sal) values (x);
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return x;
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end|
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ERROR HY000: Aggregate specific instruction(FETCH GROUP NEXT ROW) missing from the aggregate function
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create function f1(x INT) return INT AS
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begin
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set x=5;
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fetch group next row;
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return x+1;
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end |
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ERROR HY000: Non-aggregate function contains aggregate specific instructions: (FETCH GROUP NEXT ROW)
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CREATE TABLE marks(stud_id INT, grade_count INT);
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INSERT INTO marks VALUES (1,6), (2,4), (3,7), (4,5), (5,8);
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SELECT * FROM marks;
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stud_id grade_count
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1 6
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2 4
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3 7
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4 5
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5 8
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# Using PL/SQL syntax: EXCEPTION WHEN NO_DATA_FOUND
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CREATE AGGREGATE FUNCTION IF NOT EXISTS aggregate_count(x INT) RETURN INT AS
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count_students INT DEFAULT 0;
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BEGIN
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LOOP
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FETCH GROUP NEXT ROW;
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IF x THEN
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count_students:= count_students + 1;
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END IF;
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END LOOP;
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EXCEPTION
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WHEN NO_DATA_FOUND THEN
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RETURN count_students;
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END aggregate_count //
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SELECT aggregate_count(stud_id) FROM marks;
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aggregate_count(stud_id)
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5
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DROP FUNCTION IF EXISTS aggregate_count;
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# Using SQL/PSM systax: CONTINUE HANDLER
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CREATE AGGREGATE FUNCTION IF NOT EXISTS aggregate_count(x INT) RETURN INT AS
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count_students INT DEFAULT 0;
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CONTINUE HANDLER FOR NOT FOUND RETURN count_students;
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BEGIN
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LOOP
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FETCH GROUP NEXT ROW;
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IF x THEN
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SET count_students= count_students + 1;
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END IF;
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END LOOP;
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END //
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SELECT aggregate_count(stud_id) FROM marks;
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aggregate_count(stud_id)
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5
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DROP FUNCTION IF EXISTS aggregate_count;
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DROP TABLE marks;
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