Should I use != or lt; gt; 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: How to properly check if a record exists - Stack Overflow While reading some SQL Tuning-related documentation, I found this: SELECT COUNT(*) : Counts the number of rows Often is improperly used to verify the existence of a record Is SELECT COUNT(*) rea
sql - What are DDL and DML? - Stack Overflow I have heard the terms DDL and DML in reference to databases, but I don't understand what they are What are they and how do they relate to SQL?
sql - Adding an identity to an existing column - Stack Overflow Here's the trick: you can use SQL Server's ALTER TABLE SWITCH statement to change the schema of a table without changing the data, meaning you can replace a table with an IDENTITY with an identical table schema, but without an IDENTITY column The same trick works to add IDENTITY to an existing column
SQL: IF clause within WHERE clause - Stack Overflow Is it possible to use an IF clause within a WHERE clause in MS SQL? Example: WHERE IF IsNumeric(@OrderNumber) = 1 OrderNumber = @OrderNumber ELSE OrderNumber LIKE '%' + @