Select rows where column is null

Question

How do you write a SELECT statement that only returns rows where the value for a certain column is null

User · Answer

select Column from Table where Column is null

User · Answer

Do you mean something like   SELECT COLUMN1  COLUMN2 FROM MY TABLE WHERE COLUMN1    Value  OR COLUMN1 IS NULL

User · Answer

for some reasons IS NULL may not work with some column data type i was in need to get all the employees that their English full name is missing  I ve used      SELECT  emp id  Full Name Ar Full Name En from employees where Full Name En       or Full Name En is null

User · Answer

Use Is Null   select   from tblName where clmnName is null

User · Answer

select   from tableName where columnName is null

User · Answer

I m not sure if this answers your question  but using the IS NULL construct  you can test whether any given scalar expression is NULL   SELECT   FROM customers WHERE first name IS NULL   On MS SQL Server  the ISNULL   function returns the first argument if it s not NULL  otherwise it returns the second  You can effectively use this to make sure a query always yields a value instead of NULL  e g    SELECT ISNULL column1   No value found   FROM mytable WHERE column2   23   Other DBMSes have similar functionality available   If you want to know whether a column can be null  i e   is defined to be nullable   without querying for actual data  you should look into information schema

User · Answer

You want to know if the column is null  select   from foo where bar is null   If you want to check for some value not equal to something and the column also contains null values you will not get the columns with null in it  does not work   select   from foo where bar  lt  gt   value    does work   select   from foo where bar  lt  gt   value  or bar is null   in Oracle  don t know on other DBMS  some people use this  select   from foo where NVL bar  n a    lt  gt   value    if I read the answer from tdammers correctly then in MS SQL Server this is like that  select   from foo where ISNULL bar  n a    lt  gt   value    in my opinion it is a bit of a hack and the moment  value  becomes a variable the statement tends to become buggy if the variable contains  n a

[sql] Select rows where column is null

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