Oracle数据库中是否有任何布尔类型？

Is there any Boolean type in Oracle databases, similar to the BIT datatype in Ms SQL Server?

Oracle数据库中是否有任何布尔类型，类似于Ms SQL Server中的BIT数据类型？

10 个解决方案

#1

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Not only is the boolean datatype missing in Oracle's SQL (not PL/SQL), but they also have no clear recommendation about what to use instead. See this thread on asktom. From recommending CHAR(1) 'Y'/'N' they switch to NUMBER(1) 0/1 when someone points out that 'Y'/'N' depends on the English language, while e.g. German programmers might use 'J'/'N' instead.

不仅Oracle的SQL（不是PL / SQL）中缺少布尔数据类型，而且他们也没有明确建议使用什么来代替。在asktom上看到这个帖子。从推荐CHAR（1）'Y'/'N'开始，当有人指出'Y'/'N'取决于英语时，它们会切换到NUMBER（1）0/1，而例如德国程序员可能会使用'J'/'N'代替。

The worst thing is that they defend this stupid decision just like they defend the ''=NULL stupidity.

最糟糕的是，他们捍卫这个愚蠢的决定，就像他们捍卫'= NULL愚蠢。

#2

Nope.

不。

Can use:

可以使用：

IS_COOL NUMBER(1,0)

1 - true
0 - false

--- enjoy Oracle

---享受Oracle

Or use char Y/N as described here

或者使用此处描述的char Y / N.

#3

As per Ammoq and kupa's answers, We use number(1) with default of 0 and don't allow nulls.

根据Ammoq和kupa的答案，我们使用数字（1），默认值为0，不允许空值。

here's an add column to demonstrate:

这是一个用于演示的添加列：

ALTER TABLE YourSchema.YourTable ADD (ColumnName NUMBER(1) DEFAULT 0 NOT NULL);

Hope this helps someone.

希望这有助于某人。

#4

Not at the SQL level and that's a pity There is one in PLSQL though

不是在SQL级别，这很可惜PLSQL中有一个

#5

No there doesn't exist type boolean,but instead of this you can you 1/0(type number),or 'Y'/'N'(type char),or 'true'/'false' (type varchar2).

不存在类型boolean，但是你可以使用1/0（类型号），或'Y'/'N'（类型char），或'true'/'false'（类型varchar2）。

#6

There is a boolean type for use in pl/sql, but none that can be used as the data type of a column.

在pl / sql中有一个布尔类型，但没有一个可以用作列的数据类型。

#7

A common space-saving trick is storing boolean values as an Oracle CHAR, rather than NUMBER:

一个常见的节省空间的技巧是将布尔值存储为Oracle CHAR，而不是NUMBER：

#8

Just because nobody mentioned it yet: using RAW(1) also seems common practice.

仅仅因为没人提到它：使用RAW（1）似乎也是常见的做法。

#9

No, there isn't a boolean type in Oracle Database, but you can do this way:

不，Oracle数据库中没有布尔类型，但您可以这样做：

You can put a check constraint on a column.

您可以对列进行检查约束。

If your table hasn't a check column, you can add it:

如果您的表没有检查列，则可以添加它：

ALTER TABLE table_name
ADD column_name_check char(1) DEFAULT '1';

When you add a register, by default this column get 1.

添加寄存器时，默认情况下此列为1。

Here you put a check that limit the column value, just only put 1 or 0

在这里你放一个限制列值的检查，只放1或0

ALTER TABLE table_name ADD
CONSTRAINT name_constraint 
column_name_check (ONOFF in ( '1', '0' ));

#10

-1

DECLARE
error_flag  BOOLEAN := false;
BEGIN

error_flag := true;
--error_flag := 13;--expression is of wrong type

  IF error_flag THEN 

UPDATE table_a SET id= 8 WHERE id = 1;

END IF;
END;

#1

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