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 …
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 …
sql - Equals(=) vs. LIKE - Stack Overflow
Feb 12, 2009 · Using "=" is a tiny bit faster in this case (searching for an exact match) - you can check this yourself by having the same query twice in SQL Server Management Studio, once …
mysql - What does SQL Select symbol || mean? - Stack Overflow
Apr 29, 2014 · sql server: + (infix operator), concat ( vararg function ) Edit: Now Azure SQL also supports ANSI SQL ...
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 …
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 …
sql - NOT IN vs NOT EXISTS - Stack Overflow
May 18, 2007 · 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 …
sql - ORA-00904: invalid identifier - Stack Overflow
May 17, 2011 · sql> Oracle SQL allows us to ignore the case of database object names provided we either create them with names all in upper case, or without using double quotes. If we use …
How to check for Is not Null And Is not Empty string in SQL server ...
Dec 28, 2011 · 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 …
database - How to select unique records by SQL - Stack Overflow
When I perform SELECT * FROM table I got results like below: 1 item1 data1 2 item1 data2 3 item2 data3 4 item3 data4 As you can see, there are dup records from column2 (item1 are …