文章目录

• 1 概述
• 2 示例

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with t_test as (select 12.123 d from dual union allselect 12.125 d from dual
)
select t.d 原数据,trunc(t.d) 截取,trunc(t.d, 2) 截取保留2位小数,round(t.d) 取整, -- 四舍五入round(t.d, 2) 取整保留2位小数, -- 四舍五入to_char(t.d, 'FM90.99') 格式化保留2位小数from t_test t;

原数据    截取  截取保留2位小数  取整  取整保留2位小数  格式化保留2位小数
'12.123'  12   12.12       12    '12.12'            '12.12'
'12.125'  12   12.12       12    '12.13'            '12.13'

-- 9+0 的个数 = 数值的位数。
-- 超过则不显示。 小于则显示 ###
select to_char(0.123, 'FM99.99') "占位符 9",    -- .12to_char(0.123, 'FM90.99') "占位符 0",    -- 0.12to_char(11.22, 'FM990.99') 超过数值位数,  -- 11.22to_char(11.22, 'FM0.99') 小于数值位数     -- #####from dual;