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What does <> (angle brackets) mean in MS-SQL Server?
<> 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
<> 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.

What is the SQL operator name for "<>"? - Stack Overflow
Both of them work the same way and there is absolutely no difference in terms of performance or result. If != and <> both are the same, which one should be used in SQL queries? You can use either != or <> both in your queries as both technically same but I prefer to use <> as that is SQL-92 standard.

Should I use != or <> for not equal in T-SQL? - Stack Overflow
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 - 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

mysql - What does SQL Select symbol || mean? - Stack Overflow
SQL Server requires the + operator (thanks to HVD for setting me straight!). Share. Improve this answer ...

How to check for Is not Null And Is not Empty string in SQL server ...
Check the not null condition and empty string in SQL command is use 'is null / not null' and '!='. please try this sample pattern script: SELECT * FROM [Employee] WHERE EMail is not null -- not null check and Email != '' -- not empty check

How do I perform an IF...THEN in an SQL SELECT?
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 ...

SQL WITH clause example - Stack Overflow
The SQL WITH clause was introduced by Oracle in the Oracle 9i release 2 database. The SQL WITH clause allows you to give a sub-query block a name (a process also called sub-query refactoring), which can be referenced in several places within the main SQL query. The name assigned to the sub-query is treated as though it was an inline view or table.

sql - Select records based on what a field begins with? - Stack Overflow
In SQL-92 mode, you need the standard ANSI wild card. WHERE p.spineinjuryAdmit Like "c%" I used ALike to tell the database engine to expect ANSI wild cards. SQL-89 mode is used by DAO ... unless you've set the database option to use SQL-92 mode ("SQL Server compatible syntax). If you're running a query with ADO, it will always use SQL-92 mode.

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