SQL DESIGN PATTERNS EXPERT GUIDE TO SQL PROGRAMMING PDF
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But as an Excel user, you already know more about SQL than you might expect. Spreadsheet, meet relational database A database is an organized collection of data. There are many different kinds of databases, but the specific type of database SQL can communicate with is known as a relational database.
Just as an Excel workbook is composed of spreadsheets, a relational database is composed of tables, like the one below.
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If you want to exclude Ralph Abernathy's hometown from the top row in the table above, you can't just delete it. The reason you can't change cells on the fly is because a database has a rigid structure. The values in each row are tied together as a single unit. Each column must have a unique name and can only contain a specific type of data 'Integer', 'Text', 'Date', etc.
Excel's flexible structure might sound pretty good right now, but hang on. Because a database's structure is so strict, it's easier to protect your data's integrity.
In other words, it's much less likely that you'll end up with inconsistencies and errors.
And that means you can place a lot more trust in your data. The leap from formulas to queries The most common way to manipulate data in Excel is by using formulas.
A formula consists of one or more functions that tell Excel what to do with the data in a cell. The SQL equivalent of a formula is a query. Once you know what you need, you can quickly cut the columns to reduce the size of the dataset.
Like formulas, queries are composed of functions that specify data manipulations. Queries can also contain clauses, operators, expressions, and a few other components, but we're not going to go into the details here.
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What you need to know is that you can use SQL to manipulate data in pretty much any way you do in Excel. Take the IF function, for instance.
You use IF to create conditional statements that filter data or add new data based on rules you define. This structure is ideal for an IF statement with multiple conditions.
For instance, if you want to add two categories based on existing data in Excel, you have to nest one IF statement inside another IF statement.
When you add a lot of conditions, things get ugly quickly. But in SQL, you can just add a new condition as another line. In SQL, let's add multiple conditions using the college football data from above.
We're going to add a column that divides the football players into four weight groups. The IF statement for this would be a nightmare. You might be thinking, but what about charts and graphs? Many spin-off metalanguages were inspired by BNF. A BNF class describes a language construct formation, with formation defined as a pattern or the action of forming the pattern.
A class is an abstraction, we can talk about it independent of its formation. We can talk about term, independent of its definition, as being added or subtracted in expr.
We can talk about a term being a specific data type and how an expr is to be evaluated having specific combinations of data types.
Or even reordering an expression to group data types and evaluation results of mixed types. The natural-language supplement provided specific details of the language class semantics to be used by a compiler implementation and a programmer writing an ALGOL program. Natural-language description further supplemented the syntax as well. As far as the rule states, we could have space between the digits.
In the natural language we complement the BNF metalanguage by explaining that the digit sequence can have no white space between the digits.
English is only one of the possible natural languages. The origin of BNF is not as important as its impact on programming language development. Others changed it to a programming language.
The Schorre Metacompilers made it a programming language with only a few changes. Arithmetic like grouping provided simplification that removed using classes where grouping was its only value.
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BNF today is one of the oldest computer-related languages still in use. Symbols that never appear on a left side are terminals. A name-part consists of either: a personal-part followed by a last name followed by an optional suffix Jr. A personal-part consists of either a first name or an initial followed by a dot.
A street address consists of a house number, followed by a street name, followed by an optional apartment specifier, followed by an end-of-line. A zip-part consists of a town -name, followed by a comma, followed by a state code , followed by a ZIP-code followed by an end-of-line.
An opt-suffix-part consists of a suffix, such as "Sr. An opt-apt-num consists of an apartment number or an empty string i. Note that many things such as the format of a first-name, apartment specifier, ZIP-code, and Roman numeral are left unspecified here. If necessary, they may be described using additional BNF rules.
This assumes that no whitespace is necessary for proper interpretation of the rule. In the U. The other part of that rule aside from a line-end is an expression, which consists of two lists separated by a pipe. These two lists consists of some terms three terms and two terms, respectively. Each term in this particular rule is a rule-name.This is just what the people now need a lot.
If any clause herein is found illegal, invalid, or unenforceable, the clause shall be modified in compliance with applicable law in a manner that most closely matches the intent of the original language. Juxtaposition of marks or variables in a formula signifies juxtaposition of the sequence denoted.
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