SQL uses of "less than or equal to" <= vs. "not greater than ...
The !=, !< and !> are not standard comparison operators and are only supported by few systems, SQL-Server being one: msdn: Comparison Operators (Transact-SQL). MySQL also supports != but only that, not the other two. The equivalent standard SQL comparison operators are <>, >= and <=. In all situations, I would prefer the standard.
What does <> (angle brackets) mean in MS-SQL Server?
Nov 8, 2013 · <> operator means not equal to in MS SQL. It compares two expressions (a comparison operator). When you compare nonnull expressions, the result is TRUE if the left operand is not equal to the right operand; otherwise, the result is FALSE. If either or both operands are NULL, see the topic SET ANSI_NULLS (Transact-SQL). See here : Not Equal To
sql - Not equal <> != operator on NULL - Stack Overflow
Oct 9, 2014 · <> 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 can only use IS NULL/IS NOT NULL as predicates for such situations. This behavior is not specific to SQL Server. All standards-compliant SQL dialects work the same way.
Should I use != or <> for not equal in T-SQL? - Stack Overflow
Apr 6, 2009 · Yes; Microsoft themselves recommend using <> over != specifically for ANSI compliance, e.g. in Microsoft Press training kit for 70-461 exam, "Querying Microsoft SQL Server", they say "As an example of when to choose the standard form, T-SQL supports two “not equal to” operators: <> and !=. The former is standard and the latter is not.
sql server - MSSQL with SSL: The target principal name is incorrect ...
(provider: SSL Provider, error: 0 - The target principal name is incorrect.) (Microsoft SQL Server, Error: -2146893022) What is striking is that if I select Force Encryption as Yes on Sql Server Configuration Manager and I not select Encrypt connection on Microsoft Sql Server Management Studio I can connect to the database. If I execute the query:
mysql - What does SQL Select symbol || mean? - Stack Overflow
Apr 29, 2014 · SQL Server requires the + operator (thanks to HVD for setting me straight!). Share. Improve this answer ...
sql - CREATE TABLE [dbo]. [Table] - what does the dbo part mean ...
Nov 9, 2013 · That is the Schema that the table is being placed in. This is not actually required as dbo is the default schema and any objects referenced without schema specified are assumed to be in dbo.
t sql - SQL Not Like Statement - Stack Overflow
Sep 6, 2010 · T-SQL: [column] not like [any value from another select] 1. SQL NOT LIKE with multiple values. 54.
sql - NOT IN vs NOT EXISTS - Stack Overflow
In order to filter the student records that have a 10 grade in Math, we can use the EXISTS SQL operator, like this: SELECT id, first_name, last_name FROM student WHERE EXISTS ( SELECT 1 FROM student_grade WHERE student_grade.student_id = student.id AND student_grade.grade = 10 AND student_grade.class_name = 'Math' ) ORDER BY id
How do I perform an IF...THEN in an SQL SELECT?
Sep 15, 2008 · The CASE expression cannot be used to control the flow of execution of Transact-SQL statements, statement blocks, user-defined functions, and stored procedures. If your needs can not be satisfied by these limitations (for example, a need to return differently shaped result sets dependent on some condition) then SQL Server does also have a ...