SQL Server/T-SQL/Data Type/Bit

bit type column

   <source lang="sql">

4> CREATE TABLE T ( 5> int1 int IDENTITY PRIMARY KEY, 6> bit1 bit NOT NULL DEFAULT 0 7> ) 8> GO 1> 2> INSERT T (bit1) VALUES (1) 3> INSERT T (bit1) VALUES (0) 4> INSERT T DEFAULT VALUES 5> INSERT T (int1, bit1) VALUES (4,1) 6> GO (1 rows affected) (1 rows affected) (1 rows affected) Msg 544, Level 16, State 1, Server J\SQLEXPRESS, Line 5 Cannot insert explicit value for identity column in table "T" when IDENTITY_INSERT is set to OFF. 1> 2> select * from t; 3> GO int1 bit1

---

----

         1    1
         2    0
         3    0

(3 rows affected) 1> 2> drop table t; 3> GO

</source>
   
  

Count null bit1 values

   <source lang="sql">

1> 2> CREATE TABLE T ( 3> int1 int, 4> bit1 bit, 5> varchar1 varchar(3), 6> dec1 dec(5,2), 7> cmp1 AS (int1 + bit1) 8> ) 9> GO 1> INSERT T (int1, bit1) VALUES (1, 0) 2> GO (1 rows affected) 1> INSERT T (int1, varchar1) VALUES (2, "abc") 2> GO (1 rows affected) 1> INSERT T (int1, dec1) VALUES (3, 5.25) 2> GO (1 rows affected) 1> INSERT T (bit1, dec1) VALUES (1, 9.75) 2> GO (1 rows affected) 1> --Count null bit1 values 2> SELECT COUNT(*) "Count of null bit1" 3> FROM T 4> WHERE bit1 IS NULL 5> GO Count of null bit1

---

                2

(1 rows affected) 1> 2> drop table t 3> GO 1> 2>

      </source>