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TOP 10 (Most Powerful) PROC SQL Functions
TOP 10 PROC SQL Functions PROC SQL is not only one of the many SAS procedures and also a distinctive subsystem with all common features from SQL (Structured Query Language). Equipped with PROC SQL, SAS upgrades to a full-fledging relational database management system. PROC SQL provides alternative ways to manage data other than the traditional DATA Step and SAS procedures. In addition, SAS’s built-in functions are the add-on tools to increase the power of PROC SQL. In this paper, we illustrate ten popular SAS functions, which facilitate the capacity of PROC SQL in data management and descriptive statistics. INTRODUCTION Structured Query Language (SQL) is a universal computer language for all relational database management systems. PROC SQL is the implementation of the SQL syntax in SAS. It first appeared in SAS 6.0, and since then has been widely used for SAS users. PROC SQL greatly increases SAS’s flexibility in handling data, especi...
What order does PROC SQL do your work?
To optimize a Structured Query Language (SQL), the database professional must befriend this orderand perhaps even embrace it. Who is your best friend? I’m talking about the order in which SQL processes your statements. Simply put, in what order does SQL do your work? (From my previous post you know another SQL rule, the order in which YOU submit statements to SQL.) I just want us to be clear that these are two very different orders. First up, what makes SQL different from other programming languages? It’s the way SQL processes code. Most programming languages including SAS start at the top of your code and make their way to the bottom. However, SQL processes them in a unique order, known as Logical Query Processing Phase. This phase (also referred to as a clause) generates a series of virtual tables with each virtual table feeding into the next clause or phase. And no, we can’t view these virtual tables, sorry about that. That’s just the way SQL wo...