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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

如何自学SQL？ - 知乎
sql不能像编程语言一样，使用变量、条件逻辑、循环结构等对过程进行定义，以获得想要的结果。sql直来直去，只要定义必要的输入输出，没有对过程的控制。 了解sql的大致情况后，我们再来看看如何学？

What does the "@" symbol do in SQL? - Stack Overflow
The @CustID means it's a parameter that you will supply a value for later in your code. This is the best way of protecting against SQL injection. Create your query using parameters, rather than concatenating strings and variables. The database engine puts the parameter value into where the placeholder is, and there is zero chance for SQL injection.

What does SQL Select symbol - mean? - Stack Overflow
sql server: + (infix operator), concat ( vararg function ) Edit: Now Azure SQL also supports ANSI SQL ...

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.

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

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是什么，通俗的说，太专业听不懂？ - 知乎
sql是一门语言，就和我们平时说话一样，有主谓宾的层次结构，同样sql也有自己的一套语法规则。 记住这些语法规则就可以与数据库打交道了，不管是查询，新增，更新，删除数据，都可以使用既定的语法来操作数据库。

sql server 2008 - SQL query with NOT LIKE IN - Stack Overflow
This is similar to others examples but uses a CTE and a SQL Server table value constructor. References:

如何学习 SQL 语言？ - 知乎
SQL 真的不难，用 20 个小时来学习完全足够了。 「1」刷题前之前了解下 SQL 是什么： 结构化查询语言(Structured Query Language)简称SQL，是一种数据库查询和程序设计语言，用于存取数据以及查询、更新和管理关系数据库系统。 「2」准备好工具书：《SQL必知必会》

 

 

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