It's easy to keep consistent, and you can also easily recognize things like: I think that if you work with views extensively (I've worked with schemas of 1000+ views in the past), then such a naming convention is almost mandatory. I am not really an Oracle guy, so maybe there was a way around this that I wasn't aware of, but it made me use underscores and I have never gone back. In SQL, this is a bit different. View data of a table in sql server 2008. You'd think that abbreviations like FICD are meaningless, and indeed, they are, at first. becomes, If the name contains three or more underscores, take the first letter of each word, If a new abbreviation causes a conflict with the existing ones, make a pragmatic choice, What table a given column originates from, If that column has an index you can use (on a query against the view! If your DB engine can't support the SQL standard, that's its problem. Re: SQL: Selecting from "column names" with spaces in? So for example, you may find yourself only accessing tables via views that are typically just a simple "select * from foo". SELECT EmpNo, Name FROM Employee; are labeled EmpNo and Name by default. With the help of SQL or Structured Query Language, the Database Administrators store, update, manipulate and retrieve data in relational databases. Quick identifying of the module the table is from (doctors||patients). So here underscore goes better. Database names must begin with an alphabetic character, and cannot begin with an underscore. Further reading: In 11g and up, case seems to be preserved if the table name is wrapped in double quotes. What is a 7th chord and why is it important? Use the table name as a prefix plus the constrained column name. with delimiters between the elements: SQL doesn't play nice with spaces in column names and underscore works well visually. For example: If someone does not adhere to these conventions, the resulting code quickly looks non-idiomatic. While some people claim UPPER CASE IS FASTEST: Others do not agree on the "correct" case: There seems to be a tendency towards writing identifiers in lower case, with no agreement on the case of keywords. Special characters other than underscore (_) are not supported. there's wide variability on how to separate words, so there you'll have to pick whatever you like better; but at the same time, it seems there's near consensus that the table name should be singular. Ex: The purpose for such a simple abstraction layer is that it can be expanded when necessary to allow changes in one environment to avoid impacting the other. SQL is different. This is easy to work around, but a tedious problem to think of all the time. Java), they are less easy to qualify properly. (And why C# just had to be different is a point of aggravation for those of us who code in both.). Case insensitive nature of SQL supports Underscores_Scheme. Most of the developers tend to name the tables depending on the language that requires the database (JAVA, .NET, PHP, etc). why does this happen? I've never heard it called "CapitalCase" in my 30 years experience. I did an Oracle project some years ago, and it seemed that Oracle forced all my object names to upper case, which kind of blows any casing scheme. Is there a way to separate geometry that shares verts/edges? Who cares. Especially in Oracle, where one does not simply create a schema because of all the security hassles this produces (schemas and users are kinda the same thing, which is nuts of course. Also, in most dialects, people prefer snake_case for identifiers, although in SQL Server, people seem to prefer PascalCase or camelCase. The importance, as always, is to be consistent with a ruleset. SQL is different. Another technique that I've found very useful in the past is a standard approach to aliasing things. I've been reading a couple of questions/answers on StackOverflow trying to find the 'best', or should I say must accepted way, to name tables on a Database. Unlike with hungarian notation itself, where the data type is encoded in the name, in this case, we might encode some other piece of information in the name. Then you can easily translate (even automatically) names between environments. Related. These are my five cents. Opinions expressed by DZone contributors are their own. I have heard it called "camel case" the most and "Pascal case" has more recently been taken up. +1 for the comment. There isn't really a "correct" way to name things in any language, including SQL. Modern software however supports any kind of naming scheme. I have a feeling that someone in your organization was trying to follow these guidelines when they came up with element names such as Person_Person_First_Name . Transact-SQL reserved keywords can be used as identifiers or names of databases or database objects, such as tables, columns, views, and so on. A schema should exist completely independently from a user), it may be useful to encode a schema in the object name: Besides, when using views for security and access control, one might have additional prefixes or suffixes to denote the style of view: This list is obviously incomplete. For example, the columns in the result. Why do some Python functions have underscores "__" before and after the function name? Another example is when joining tables, which probably have duplicate column names: This query might produce two ambiguous ID columns: CUSTOMER.ID and ADDRESS.ID. In other words, yes, well done, you've identified some consistent schemes. Are two wires coming out of the same circuit breaker safe? What's in a Name: Java Naming Conventions? SQL Server Invalid Column name after adding new column. But sometimes they do. your coworkers to find and share information. @ismriv that's only a problem if you're inconsistent, if you're, I totally agree that consistency is key, but this is an old question and for people using newer database platforms like Redshift and Snowflake that default to either all upper case or lower case identifiers, I'd add that it. In many languages, naming conventions (of identifiers) is not really relevant, because the way the language designs namespacing, there is relatively little risk for conflict. ). Views … Every table will have a file in the filesystem, and some of them are case-insensitive (e.g. As @David stated consistency is far more important than the naming convention. Just grab your columns names from: select column_name from information_schema.columns Sure, as someone else in the thread, AS will allow you to alias/change output on a select/query, but that doesn’t really do a whole lot to change existing structures (sp_rename comes in for that). Also, on a side note to the current naming scheme PascalCase is better, specially if you don't use Aliases for the SQL Queries. There should only ever be one source of truth for a piece of data. Applications of equivariant homotopy theory in chromatic homotopy theory. You can decide to live with that or choose another engine. Part 12 in a series on the basics of the relational database and SQL By Melanie Caffrey . Specially when you namings travel to models, dto and frontend at the end. I typically use PascalCase and the entities are singular: It mimics the naming conventions for classes in my application keeping everything pretty neat, clean, consistent, and easy to understand for everybody. Example: INSERT INTO DEV_YR_51.dbo.testtable ("day-number", maximum) VALUES (?,?) Yes...yes I do. But once you start writing a ton of SQL against this schema, you start "learning" the abbreviations, and they become meaningful. 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