sql - NOT IN vs NOT EXISTS - Stack Overflow
Which of these queries is the faster? NOT EXISTS: SELECT ProductID, ProductName FROM Northwind..Products p WHERE NOT EXISTS ( SELECT 1 FROM Northwind..[Order Details] …
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 …
What does SQL Select symbol || mean? - Stack Overflow
Oct 14, 2017 · sql server: + (infix operator), concat ( vararg function ) Edit : Now Azure SQL also supports ANSI SQL standard || operator for string concatenation. Docs link.
What does the colon sign ":" do in a SQL query?
What does ":" stand for in a query? A bind variable. Bind variables allow a single SQL statement (whether a query or DML) to be re-used many times, which helps security (by disallowing SQL …
How do I perform an IF...THEN in an SQL SELECT?
Sep 15, 2008 · 2059 The CASE statement is the closest to IF in SQL and is supported on all versions of SQL Server.
SQL: IF clause within WHERE clause - Stack Overflow
Sep 18, 2008 · Is it possible to use an IF clause within a WHERE clause in MS SQL? Example: WHERE IF IsNumeric(@OrderNumber) = 1 OrderNumber = @OrderNumber ELSE …
sql server - SQL MAX of multiple columns? - Stack Overflow
Mar 8, 2012 · How do you return 1 value per row of the max of several columns: TableName [Number, Date1, Date2, Date3, Cost] I need to return something like this: [Number, …
SQL to find the number of distinct values in a column
SQL to find the number of distinct values in a column Asked 17 years, 1 month ago Modified 2 years, 6 months ago Viewed 825k times
sql - Copy data into another table - Stack Overflow
How to copy/append data from one table into another table with same schema in SQL Server? Edit: let's say there is a query select * into table1 from table2 where 1=1 which creates table1 …
Remove all spaces from a string in SQL Server - Stack Overflow
May 3, 2012 · What is the best way to remove all spaces from a string in SQL Server 2008? LTRIM(RTRIM(' a b ')) would remove all spaces at the right and left of the string, but I also …