Is there any boolean type in Oracle databases?
SqlDatabaseOracleBooleanSqldatatypesSql Problem Overview
Is there any Boolean type in Oracle databases, similar to the BIT datatype in Ms SQL Server?
Sql Solutions
Solution 1 - Sql
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.
The worst thing is that they defend this stupid decision just like they defend the ''=NULL stupidity.
Solution 2 - Sql
Nope.
Can use:
IS_COOL NUMBER(1,0)
1 - true
0 - false
--- enjoy Oracle
Or use char Y/N as described here
Solution 3 - Sql
As per Ammoq and kupa's answers, We use number(1) with default of 0 and don't allow nulls.
here's an add column to demonstrate:
ALTER TABLE YourSchema.YourTable ADD (ColumnName NUMBER(1) DEFAULT 0 NOT NULL);
Hope this helps someone.
Solution 4 - Sql
No, there isn't a boolean type in Oracle Database, but you can do this way:
You can put a check constraint on a column.
If your table hasn't a check column, you can add it:
ALTER TABLE table_name
ADD column_name_check char(1) DEFAULT '1';When you add a register, by default this column get 1.
Here you put a check that limit the column value, just only put 1 or 0
ALTER TABLE table_name ADD
CONSTRAINT name_constraint
column_name_check (ONOFF in ( '1', '0' ));Solution 5 - Sql
Not at the SQL level and that's a pity There is one in PLSQL though
Solution 6 - Sql
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).
Solution 7 - Sql
There is a boolean type for use in pl/sql, but none that can be used as the data type of a column.
Solution 8 - Sql
If you are using Java with Hibernate then using NUMBER(1,0) is the best approach. As you can see in here, this value is automatically translated to Boolean by Hibernate.
Solution 9 - Sql
A common space-saving trick is storing boolean values as an Oracle CHAR, rather than NUMBER:
Solution 10 - Sql
Just because nobody mentioned it yet: using RAW(1) also seems common practice.
Solution 11 - Sql
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;