1.問題起源
????? oracle 數據庫字段值為小于1的小數時，使用char類型處理，會丟失小數點前面的0
????? 例如0.35就變成了.35
2.解決辦法:用to_char函數格式化數字顯示
????? select???? to_char(0.338,'fm9999999990.00') from dual;
???? 結果:0.34
???? 這里重點要看 fm9999999999.99,表示整數部分最多10位,小數部分2位,fm表示去 掉轉位字符串后前面的空格,不加fm,0.34前面會有空格的.

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

?

?

轉自：http://0414.iteye.com/blog/1181419

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