sql - MySQL SELECT only not null values - Stack Overflow
Is it possible to do a select statement that takes only NOT NULL values? Right now I am using this: SELECT * FROM table And then I have to filter out the null values with a php loop. Is …
How to check for Is not Null And Is not Empty string in SQL server ...
Dec 28, 2011 · How can we check in a SQL Server WHERE condition whether the column is not null and not the empty string ('')?
sql - Not equal <> != operator on NULL - Stack Overflow
Apr 14, 2011 · 437 <> is Standard SQL-92; != is its equivalent. Both evaluate for values, which NULL is not -- NULL is a placeholder to say there is the absence of a value. Which is why you …
sql - NULL values inside NOT IN clause - Stack Overflow
SQL NOT IN constraint and NULL values From the text of the question it appears that the problem was occurring in a SQL DML SELECT query, rather than a SQL DDL CONSTRAINT.
sql - What is the difference between "Is Not Null" and "Not Is Null ...
Nov 2, 2010 · SELECT column FROM mytable WHERE column IS NOT NULL will most probably be executed with an index fast full scan, with no additional checks made in runtime (since the …
Selecting rows which are not null in sql - Stack Overflow
May 4, 2015 · The code will not work in SQL because it is not possible to test for NULL values with the following operators =, <, or <>. It is not possible to compare NULL and 0 as they are …
sql - WHERE all IS NOT NULL - Stack Overflow
all columns must not be null select * from schedule where col1 is not null AND col2 is not null AND .. at least one column should be non-null select * from schedule where col1 is not null OR …
sql - Check if any column is NOT NULL - Stack Overflow
Do you want to know if any column has a NULL value (as stated in the question title and question body), or whether any column does not have a NULL value (as written in your SQL query). …
Why does NULL = NULL evaluate to false in SQL server
Dec 4, 2009 · Also, SQL Server does not give (NULL = NULL) -> FALSE. To quote the documentation for ANSI_NULLS: "When ON is specified, all comparisons to a null value …
SQL is null and = null - Stack Overflow
Mar 6, 2012 · The reasoning is that a null means "unknown", so the result of any comparison to a null is also "unknown". So you'll get no hit on rows by coding where my_column = null. SQL …