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If the company has zero earnings, the predefined exception DECLARE pe_ratio NUMBER(3,1); BEGIN SELECT price / earnings INTO pe_ratio FROM stocks WHERE symbol = 'XYZ'; -- might cause division-by-zero error INSERT INTO stats (symbol, ratio) VALUES ('XYZ', pe_ratio); COMMIT; EXCEPTION -- exception handlers begin WHEN ZERO_DIVIDE THEN -- handles 'division by zero' error INSERT INTO stats (symbol, ratio) VALUES ('XYZ', NULL); COMMIT; ...
WHEN OTHERS THEN -- handles all other errors ROLLBACK; END; -- exception handlers and block end here Error processing is not clearly separated from normal processing; nor is it robust.
You can, however, declare the same exception in two different blocks.
Exceptions declared in a block are considered local to that block and global to all its sub-blocks.
The host cursor variable and PL/SQL cursor variable involved in an assignment have incompatible return types.