作用: 四舍五入
SELECT CAST('9.0' AS DECIMAL) FROM DUAL; -- 9

SELECT CAST('9.5' AS DECIMAL) FROM DUAL; -- 10

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SELECT CAST('9.6' AS DECIMAL) FROM DUAL; -- 10

SELECT CAST('9.3' AS DECIMAL) FROM DUAL; -- 9

SELECT CAST('9.5' AS DECIMAL(10,3)) FROM DUAL; -- 9.500

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