http://www.bing.com:80/search?q=SQL+Server+Ave+QuerySearch resultshttp://www.bing.com:80/s/a/rsslogo.gifhttp://www.bing.com:80/search?q=SQL+Server+Ave+QueryCopyright © 2026 Microsoft. All rights reserved. These XML results may not be used, reproduced or transmitted in any manner or for any purpose other than rendering Bing results within an RSS aggregator for your personal, non-commercial use. Any other use of these results requires express written permission from Microsoft Corporation. By accessing this web page or using these results in any manner whatsoever, you agree to be bound by the foregoing restrictions.https://stackoverflow.com/questions/23372550/what-does-sql-select-symbol-meanWhat does SQL Select symbol || mean? Asked 11 years, 11 months ago Modified 1 year, 2 months ago Viewed 189k timesThu, 02 Apr 2026 20:05:00 GMThttps://stackoverflow.com/questions/23919378/what-does-double-bars-mean-in-sqlSQL Server uses '+' as a string concatenation operator, for instance. (Of course, the better solution would have been for the poster to simply run the query without the count() to see what it did in the first place instead of posting here.)Fri, 03 Apr 2026 08:08:00 GMThttps://stackoverflow.com/questions/19855497/what-does-angle-brackets-mean-in-ms-sql-serverIn My Query one place some other developer using <> (angle brackets) What does it mean ?Thu, 02 Apr 2026 13:09:00 GMThttps://stackoverflow.com/questions/5658457/not-equal-operator-on-null11 In SQL, anything you evaluate / compute with NULL results into UNKNOWN This is why SELECT * FROM MyTable WHERE MyColumn != NULL or SELECT * FROM MyTable WHERE MyColumn <> NULL gives you 0 results. To provide a check for NULL values, isNull function is provided. Moreover, you can use the IS operator as you used in the third query.Fri, 03 Apr 2026 04:40:00 GMThttps://stackoverflow.com/questions/173041/not-in-vs-not-existsWhich of these queries is the faster? NOT EXISTS: SELECT ProductID, ProductName FROM Northwind..Products p WHERE NOT EXISTS ( SELECT 1 FROM Northwind..[Order Details] od WHERE p.Fri, 03 Apr 2026 16:07:00 GMThttps://stackoverflow.com/questions/723195/should-i-use-or-for-not-equal-in-t-sqlYes; 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.Thu, 02 Apr 2026 13:45:00 GMThttps://www.zhihu.com/question/349924681SQL是一种用于处理数据的语言，就像我们说的汉语、英语一样，有特定的语法结构，让我们灵活地处理数据。 SQL并不难学，首先得理解 S Q L 三个字母分别代表什么。 Structured Query Language，简写为SQL，意思是结构化查询语言。也就是说SQL是用来查询数据用的，通过代码指令来实现个性化的数据抽取 ...Thu, 02 Apr 2026 11:08:00 GMThttps://www.zhihu.com/question/30357711了解SQL的大致情况后，我们再来看看如何学？ SQL是所有数据库查询的语言，sql由于本身结构化的特点，非常容易入手。 针对不同的数据库，如hivesql、mysql、sqlserver、oracle等，sql语法会有所不同，但是总体上大同小异，只是细微处的差别。Fri, 03 Apr 2026 20:18:00 GMThttps://stackoverflow.com/questions/3166117/what-does-the-sql-symbol-mean-and-how-is-it-usedThe other answers are correct if you're dealing with SQL Server, and it's clear that you are. But since the question title just says SQL, I should mention that there are some forms of SQL such as MySQL where a pound sign is used as an alternative commenting symbol.Wed, 01 Apr 2026 22:00:00 GMThttps://stackoverflow.com/questions/61187871/sql-asterisk-all-possible-usesIt is used in sql-server for xml. In the code below, aliasing the subquery as ' [*]' means that COLUMN_NAME and DATA_TYPE xml nodes output on the same level as TABLE_SCHEMA and TABLE_NAME.Thu, 02 Apr 2026 20:05:00 GMT