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1.问题起源

oracle 数据库字段值为小于1的小数时，使用char类型处理，会丢失小数点前面的0

例如0.35就变成了.35

2.解决办法:用to_char函数格式化数字显示

select     to_char(0.338,'fm9999999990.00') from dual;

结果:0.34

这里重点要看 fm9999999999.99,表示整数部分最多10位,小数部分2位,fm表示去 掉转位字符串后前面的空格,不加fm,0.34前面会有空格的.

3.with的使用

WITH TMP1 AS (

SELECT 1 AS A, 2 AS B FROM DUAL

UNION

SELECT 1 AS A, 3 AS B FROM DUAL

UNION

SELECT 1 AS A, 4 AS B FROM DUAL

),

TMP2 AS (

SELECT 1 AS A, 2 AS B FROM DUAL

UNION

SELECT 1 AS A, 3 AS B FROM DUAL

UNION

SELECT 2 AS A, 4 AS B FROM DUAL

)

SELECT TMP1.*,TMP2.*

FROM TMP1 JOIN TMP2

ON TMP1.A = TMP2.A