What are the values of Pol type variables?

Directly via "bolean bl = true; to define a Boer type whose value is true.

Note: Pol variables can only have two values: true and false. And the value must be assigned during the initialization process, if the assignment is not the above two values, an error will be reported directly.

There are only two values for a Boolean type: true and false.

A boolean variable is a variable that has two logical states. It contains two values: true and false.

If you use a Boolean variable in your expression, an integer value of 1 or 0 is given based on the true value of the variable value. To convert an integer to a Boolean variable, if the integer value is 0, the Boolean value is incorrect; Otherwise, if the integer value is not 0, the boolean value is true. Boolean variables are often used as markers at runtime, such as logic tests for changing program flow.

I think it's a yes or no value.

It's just a different form of expression.

There's no need to be so troublesome.

It means yes and no, true and false.

Haha, if you don't understand, just use integers instead of yes and no, which are 0 and 1 (but not recommended).

Initialization must be copied??? Will I report an error if I only take the name?

Variable Definition:

Variable Type Variable Name = Variable Value.

Boolean types are data that only have two cases: true and false. Computer.

Boolean objects can be given literal values of true or false, and the corresponding relationship is the concept of true and false.

Boolean types have only two values, false and true.

It is usually used to determine whether a condition is true.

A variable value of 0 is false, otherwise it is true, and the Boolean variable has only these two values.

For example: Example 1: bool pb= ; // pb=true;

Example 2: bool pt=0; // pt=false;

Boolean data is a noun in SQL Server, and Boolean data is made up of binary (binary) numbers, both 0 and 1

1 is true and 0 is false

In computer science, a Boolean data type, also known as a logical data type, is a primitive type with only two values: non-zero (usually 1 or -1) and zero (equivalent to true and false, respectively).

In some languages, Boolean data types are defined to represent more than two truths. For example, the ISO SQL:1999 standard defines that a SQL Boolean can store three possible values:

True, False, Unknown (SQL Null is treated as if it were unknown truth, but only used in Boolean).

This data type is used in Boolean and other operations, such as with (and, & or (or, |XOR (xor, neqv, equivalence (eqv, =, ==) and NOT (not, these are consistent with logical algebra and arithmetic operations.

Boolean types are basic data types, also known as standard data types.

In general, a Boolean type is two values, one is true or 1, and the other is false or 0;

The null value null converted to a boolean type is false

The number type (minus 0) is converted to a boolean type is true, 0 is false, and everything else is true such as 1, 2, 3, 4, and so on

string''with""Converting these two null values to a boolean is false, and everything else is true

Data types can be converted to each other, and to understand Boolean types, you need to understand which of the other data types are false and which are true. Boolean types are often used to determine whether an expression is true or not, and if true it continues, false exits. It can also be used as a return false value of a function to end the script.

is int, the difference is that the bool value is generally represented by 1 or 0, and does not represent other integers, which is generally used as a flag.

A boolean variable is a variable that has two logical states, and it contains two values: true and false.

If a Boolean variable is used in the expression, an integer value of 1 or 0 is given depending on whether the value of the variable is true or false. To convert an integer variable to a Boolean variable, if the integer value is 0, its Boolean value is false; Conversely, if the integer value is non-0, then its Boolean value is true.

Boolean variables are often used as flags at runtime, such as to perform logic tests to change the flow of a program.

In SQL Server, the data type used for boolean values is bit.

Bit is called a bit data type, and its data can have two values: 0 and 1, and the length is 1 bit. When entering values other than 0, the system treats them as if they were 1s. This data type is often used as a logical variable to represent a binary choice of true, false, or, no, etc.

Here's how to use it when you create it:

create table test

id int,flag bit);

bit(1)

The bit is represented by the number 0 or 1 and does not use quotation marks. If a number greater than 1 is used, it will be converted to 1.

tinyint(1)

Or you can use the bit type .. in SQL Server

Just don't return ture false but 1 0 ...