Is there a Boolean data type in Microsoft SQL Server like there is in MySQL

Question

Is there a Boolean data type in Microsoft SQL Server like there is in MySQL   If so  what is the alternative in MS SQL Server

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Use the BIT datatype to represent boolean data  A BIT field s value is either 1 0 or NULL   create table  lt tablename gt         lt columnName gt  bit     Unless you want a threeway boolean you should add NOT NULL DEFAULT 0 like so   create table  lt tablename gt         lt columnName gt  bit not null default 0

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Use the Bit datatype  It has values 1 and 0 when dealing with it in native T-SQL

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You may want to use the BIT data type  probably setting is as NOT NULL  Quoting the MSDN article   bit  Transact-SQL  An integer data type that can take a value of 1  0  or NULL  The SQL Server Database Engine optimizes storage of bit columns  If there are 8 or less bit columns in a table  the columns are stored as 1 byte  If there are from 9 up to 16 bit columns  the columns are stored as 2 bytes  and so on  The string values TRUE and FALSE can be converted to bit values  TRUE is converted to 1 and FALSE is converted to 0

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You could use the BIT datatype to represent boolean data  A BIT field s value is either 1  0  or null

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I use TINYINT 1 datatype in order to store boolean values in SQL Server though BIT is very effective

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There is boolean data type in SQL Server  Its values can be TRUE  FALSE or UNKNOWN  However  the boolean data type is only the result of a boolean expression containing some combination of comparison operators  e g      lt  gt    lt    gt    or logical operators  e g  AND  OR  IN  EXISTS   Boolean expressions are only allowed in a handful of places including the WHERE clause  HAVING clause  the WHEN clause of a CASE expression or the predicate of an IF or WHILE flow control statement    For all other usages  including the data type of a column in a table  boolean is not allowed  For those other usages  the BIT data type is preferred  It behaves like a narrowed-down INTEGER which allows only the values 0  1 and NULL  unless further restricted with a NOT NULL column constraint or a CHECK constraint   To use a BIT column in a boolean expression it needs to be compared using a comparison operator such as     lt  gt  or IS NULL  e g   SELECT     a answer body FROM answers AS a WHERE a is accepted   0    From a formatting perspective  a bit value is typically displayed as 0 or 1 in client software  When a more user-friendly format is required  and it can t be handled at an application tier in front of the database  it can be converted  just-in-time  using a CASE expression e g   SELECT     a answer body      CASE a is accepted WHEN 1 THEN  TRUE  ELSE  FALSE  END AS is accepted FROM answers AS a    Storing boolean values as a character data type like char 1  or varchar 5  is also possible  but that is much less clear  has more storage network overhead  and requires CHECK constraints on each column to restrict illegal values   For reference  the schema of answers table would be similar to   CREATE TABLE answers                answer body nvarchar MAX  NOT NULL      is accepted bit NOT NULL DEFAULT  0

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SQL Server uses the Bit datatype

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You can use Bit DataType in SQL Server to store boolean data

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You are looking for a bit   It stores 1 or 0  or NULL   Alternatively  you could use the strings  true  and  false  in place of 1 or 0  like so- declare  b1 bit    false  print  b1                    --prints 0  declare  b2 bit    true  print  b2                    --prints 1  Also  any non 0 value  either positive or negative  evaluates to  or converts to in some cases  a 1  declare  i int   -42 print cast  i as bit     --will print 1  because  i is not 0  Note that SQL Server uses three valued logic  true  false  and NULL   since NULL is a possible value of the bit data type   Here are the relevant truth tables -  More information on three valued logic- Example of three valued logic in SQL Server http   www firstsql com idefend3 htm https   www simple-talk com sql learn-sql-server sql-and-the-snare-of-three-valued-logic

[sql-server] Is there a Boolean data type in Microsoft SQL Server like there is in MySQL?

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