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Snippet Name: Number Functions: Calculate ratio between X and Y columns

Description: This block calculates the ratio between the X and Y columns of the RATIO table. If the ratio is greater than 0.72, the block inserts the ratio into RESULT_TABLE. Otherwise, it inserts -1.
If the denominator is zero, ZERO_DIVIDE is raised, and a zero is inserted into RESULT_TABLE.

Comment: (none)

Language: PL/SQL
Highlight Mode: PLSQL
Last Modified: March 03rd, 2009

```DECLARE
numerator    NUMBER;
denominator  NUMBER;
the_ratio    NUMBER;
lower_limit  CONSTANT NUMBER := 0.72;
samp_num     CONSTANT NUMBER := 132;
BEGIN
SELECT x, y INTO numerator, denominator FROM result_table
WHERE sample_id = samp_num;
the_ratio := numerator/denominator;
IF the_ratio > lower_limit THEN
INSERT INTO ratio VALUES (samp_num, the_ratio);
ELSE
INSERT INTO ratio VALUES (samp_num, -1);
END IF;
COMMIT;
EXCEPTION
WHEN ZERO_DIVIDE THEN
INSERT INTO ratio VALUES (samp_num, 0);
COMMIT;
WHEN OTHERS THEN
ROLLBACK;
END;```

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