法语十进制格式数字的 sqlite sum()

Posted 2023-03-31

【中文标题】法语十进制格式数字的 sqlite sum()

【英文标题】：sqlite sum() of French decimal format numbers

【发布时间】：2015-01-26 14:39:03

【问题描述】：

当我意识到这种类型的 SQLite SQL 查询时：

SELECT SUM(Column) as TOTAL_DEBIT FROM table_name;

我希望加实数，但它给了我整数除法的总和。

例如：

SELECT SUM(DEBIT) as TOTAL_DEBIT FROM DEBIT

下表中的 SQL 查询给出：

TOTAL_DEBIT
11475

我希望我能得到这样的结果：

TOTAL_DEBIT
11482,79

示例表：

   DROP TABLE IF EXISTS "DEBIT";
   CREATE TABLE "DEBIT" ("DATE" DATETIME NOT NULL , "DEBIT" REAL NOT NULL );
   INSERT INTO "DEBIT" VALUES('23/12/13','29,90');
   INSERT INTO "DEBIT" VALUES('23/12/13','304,00');
   INSERT INTO "DEBIT" VALUES('15/01/14','1245,48');
   INSERT INTO "DEBIT" VALUES('21/01/14','304,00');
   INSERT INTO "DEBIT" VALUES('23/01/14','30,00');
   INSERT INTO "DEBIT" VALUES('28/01/14','129,10');
   INSERT INTO "DEBIT" VALUES('31/01/14','32,10');
   INSERT INTO "DEBIT" VALUES('21/02/14','30,00');
   INSERT INTO "DEBIT" VALUES('21/02/14','304,00');
   INSERT INTO "DEBIT" VALUES('17/03/14','117,66');
   INSERT INTO "DEBIT" VALUES('21/03/14','30,00');
   INSERT INTO "DEBIT" VALUES('21/03/14','304,00');
   INSERT INTO "DEBIT" VALUES('02/04/14','175,62');
   INSERT INTO "DEBIT" VALUES('22/04/14','304,00');
   INSERT INTO "DEBIT" VALUES('23/04/14','30,00');
   INSERT INTO "DEBIT" VALUES('30/04/14','32,10');
   INSERT INTO "DEBIT" VALUES('21/05/14','304,00');
   INSERT INTO "DEBIT" VALUES('22/05/14','2838,00');
   INSERT INTO "DEBIT" VALUES('22/05/14','30,00');
   INSERT INTO "DEBIT" VALUES('30/05/14','145,41');
   INSERT INTO "DEBIT" VALUES('23/06/14','30,00');
   INSERT INTO "DEBIT" VALUES('23/06/14','304,00');
   INSERT INTO "DEBIT" VALUES('25/06/14','112,48');
   INSERT INTO "DEBIT" VALUES('21/07/14','304,00');
   INSERT INTO "DEBIT" VALUES('22/07/14','30,00');
   INSERT INTO "DEBIT" VALUES('24/07/14','1245,48');
   INSERT INTO "DEBIT" VALUES('25/07/14','127,68');
   INSERT INTO "DEBIT" VALUES('31/07/14','32,10');
   INSERT INTO "DEBIT" VALUES('12/08/14','23,89');
   INSERT INTO "DEBIT" VALUES('21/08/14','30,00');
   INSERT INTO "DEBIT" VALUES('21/08/14','304,00');
   INSERT INTO "DEBIT" VALUES('10/09/14','480,00');
   INSERT INTO "DEBIT" VALUES('22/09/14','30,00');
   INSERT INTO "DEBIT" VALUES('22/09/14','304,00');
   INSERT INTO "DEBIT" VALUES('29/09/14','131,37');
   INSERT INTO "DEBIT" VALUES('21/10/14','30,00');
   INSERT INTO "DEBIT" VALUES('21/10/14','304,00');
   INSERT INTO "DEBIT" VALUES('24/10/14','96,00');
   INSERT INTO "DEBIT" VALUES('31/10/14','32,50');
   INSERT INTO "DEBIT" VALUES('21/11/14','304,00');
   INSERT INTO "DEBIT" VALUES('24/11/14','30,00');
   INSERT INTO "DEBIT" VALUES('28/11/14','143,92');
   INSERT INTO "DEBIT" VALUES('22/12/14','30,00');
   INSERT INTO "DEBIT" VALUES('22/12/14','304,00');

提前感谢您的帮助和问候， 阿尔班

【问题讨论】：

啊！问题来自法语十进制格式：在法国，逗号用于分隔实数。国际格式使用句点作为分隔符。

数字是否以字符格式存储？

另一个困难是如果格式中已经有句点.（标记数千、数百万等）。在这种情况下，如下所述的简单REPLACE() 将不起作用。

您显示的表格使用 REAL。那么为什么要插入字符串呢？插入数值，例如 29.90 而不是 '29,90' 应该没有问题。不幸的是，SQLite 至少可以说对数据类型不是很严格，所以一旦你输入字符串，它很可能会存储字符串而不是数字，而不是引发异常。而且看起来它在对字符串求和时甚至不会出错，而只是取字符串开头的数字。

【参考方案1】：

你能不能先REPLACE,SUM然后再REPLACE呢？

SELECT REPLACE(SUM(REPLACE(DEBIT,',','.')),'.',',') AS TOTAL_DEBIT 
FROM DEBIT

【参考方案2】：

如果数字存储为文本，那么您可以执行以下操作（我不会依赖隐式转换）：

SELECT REPLACE(SUM(CAST(REPLACE(debit, ',', '.') AS REAL)), '.', ',') AS total_debit
  FROM debit

【参考方案3】：

我忘记了法国小数分隔符与国际十进制系统不同：用点代替逗号时效果很好：

SQL 查询：

SELECT ROUND(SUM(DEBIT),2) as amount FROM DEBIT;

这个 SQL 脚本效果很好：

DROP TABLE IF EXISTS "DEBIT";
CREATE TABLE "DEBIT" ("DATE" DATETIME NOT NULL , "DEBIT" REAL NOT NULL );
INSERT INTO "DEBIT" VALUES('23/12/13','29.90');
INSERT INTO "DEBIT" VALUES('23/12/13','304.00');
INSERT INTO "DEBIT" VALUES('15/01/14','1245.48');
INSERT INTO "DEBIT" VALUES('21/01/14','304.00');
INSERT INTO "DEBIT" VALUES('23/01/14','30.00');
INSERT INTO "DEBIT" VALUES('28/01/14','129.10');
INSERT INTO "DEBIT" VALUES('31/01/14','32.10');
INSERT INTO "DEBIT" VALUES('21/02/14','30.00');
INSERT INTO "DEBIT" VALUES('21/02/14','304.00');
INSERT INTO "DEBIT" VALUES('17/03/14','117.66');
INSERT INTO "DEBIT" VALUES('21/03/14','30.00');
INSERT INTO "DEBIT" VALUES('21/03/14','304.00');
INSERT INTO "DEBIT" VALUES('02/04/14','175.62');
INSERT INTO "DEBIT" VALUES('22/04/14','304.00');
INSERT INTO "DEBIT" VALUES('23/04/14','30.00');
INSERT INTO "DEBIT" VALUES('30/04/14','32.10');
INSERT INTO "DEBIT" VALUES('21/05/14','304.00');
INSERT INTO "DEBIT" VALUES('22/05/14','2838.00');
INSERT INTO "DEBIT" VALUES('22/05/14','30.00');
INSERT INTO "DEBIT" VALUES('30/05/14','145.41');
INSERT INTO "DEBIT" VALUES('23/06/14','30.00');
INSERT INTO "DEBIT" VALUES('23/06/14','304.00');
INSERT INTO "DEBIT" VALUES('25/06/14','112.48');
INSERT INTO "DEBIT" VALUES('21/07/14','304.00');
INSERT INTO "DEBIT" VALUES('22/07/14','30.00');
INSERT INTO "DEBIT" VALUES('24/07/14','1245.48');
INSERT INTO "DEBIT" VALUES('25/07/14','127.68');
INSERT INTO "DEBIT" VALUES('31/07/14','32.10');
INSERT INTO "DEBIT" VALUES('12/08/14','23.89');
INSERT INTO "DEBIT" VALUES('21/08/14','30.00');
INSERT INTO "DEBIT" VALUES('21/08/14','304.00');
INSERT INTO "DEBIT" VALUES('10/09/14','480.00');
INSERT INTO "DEBIT" VALUES('22/09/14','30.00');
INSERT INTO "DEBIT" VALUES('22/09/14','304.00');
INSERT INTO "DEBIT" VALUES('29/09/14','131.37');
INSERT INTO "DEBIT" VALUES('21/10/14','30.00');
INSERT INTO "DEBIT" VALUES('21/10/14','304.00');
INSERT INTO "DEBIT" VALUES('24/10/14','96.00');
INSERT INTO "DEBIT" VALUES('31/10/14','32.50');
INSERT INTO "DEBIT" VALUES('21/11/14','304.00');
INSERT INTO "DEBIT" VALUES('24/11/14','30.00');
INSERT INTO "DEBIT" VALUES('28/11/14','143.92');
INSERT INTO "DEBIT" VALUES('22/12/14','30.00');
INSERT INTO "DEBIT" VALUES('22/12/14','304.00');

【讨论】：

您根本不应该依赖区域设置。日期是一个日期，应以 ISO 格式“yyyy-mm-dd”输入，无论任何区域设置如何都能被识别。数字也一样。数字不是字符串。因此，既不要输入“20.90”，也不要输入“29,90”，而是输入不带引号的 29.90。