Also, on a side note to the current naming scheme PascalCase is better, specially if you don't use Aliases for the SQL Queries. 0. I came to conclusion that if DBs from different vendors are used for one project there are two best ways: The reason is that some database will convert all characters to uppercase and some to lowercase. to remove underscore ‎01-13-2016 09:48 PM Today I was grappling with shaping a series of Queries based on a SQL Datawarehouse. Every table will have a file in the filesystem, and some of them are case-insensitive (e.g. I agree - underscore has least issues in comparing with Pascal or camel Casing. Lowercase alpha-numeric+underscore will always work consistently. Which licenses give me a guarantee that a software I'm installing is completely open-source, free of closed-source dependencies or components? After reading a lot of other opinions I think it's very important to use the naming conventions of the language, consistency is more important than naming conventions only if you're (and will be) the only developer of the application. Transact-SQL reserved keywords can be used as identifiers or names of databases or database objects, such as tables, columns, views, and so on. These are my five cents. We can test for compliance with SQL Server identifier spec very simply with the following SQL. One of the best ways to achieve this isolation is to have table and column names start with an underscore "_". With the help of SQL or Structured Query Language, the Database Administrators store, update, manipulate and retrieve data in relational databases. Under SQL-92 table and field names should not: Contain SQL special characters like the hyphen/dash/minus character. rev 2020.12.18.38240, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. You can decide to live with that or choose another engine. SELECT EmpNo, Name FROM Employee; are labeled EmpNo and Name by default. Progress ABL/4GL allows table and field names to be created with with hyphens and start with underscore characters. Unfortunately there is no "best" answer to this question. 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. I use underscores. Yes...yes I do. using views for security and access control, Developer There should only ever be one source of truth for a piece of data. It may often happen that, we see a requirement to change the name of the column in the database to serve their purpose. The way I've been naming tables till now is doing something like: I would like to read any opinions regarding naming conventions. So for example, you may find yourself only accessing tables via views that are typically just a simple "select * from foo". Get on with it! Did the Allies try to "bribe" Franco to join them in World War II? Join the DZone community and get the full member experience. Modern software however supports any kind of naming scheme. http://www.teamten.com/lawrence/programming/use-singular-nouns-for-database-table-names.html, How digital identity protects your software, Podcast 297: All Time Highs: Talking crypto with Li Ouyang. Views … That's for style. Can we give underscore in a MySQL table name? 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. Making statements based on opinion; back them up with references or personal experience. The table names are stored in an SQL Table called 'Manage_Tables' and I have 9 tables shown there. /[a-z_][a-z0-9_]*/ is really the only pattern of names that seamlessly translates between different platforms. We could just not use aliases and always fully qualify all identifiers: But that quickly turns out to be verbose, especially with longer table names, so also not very readable. Underscores or camelCase in PostgreSQL identifiers, when the programming language uses camelCase? When you're using a code generator like jOOQ's, the generated column names on views will already include the table name as a prefix, so you can easily "see" what you're querying. These may be identified as the table name with just a suffix of '_v' or you could put them in a different schema. But sometimes they do. The importance, as always, is to be consistent with a ruleset. Easy to understand, to prevent confusions. I stumbled upon this thread while searching for the solution to a similar problem, and while my comment really has nothing to do with this problem's solution I couldn't help but make one. Example: INSERT INTO DEV_YR_51.dbo.testtable ("day-number", maximum) VALUES (?,?) OSX). For example: If someone does not adhere to these conventions, the resulting code quickly looks non-idiomatic. This does not make sense when you want to access the same table by two different languages that have different naming conventions. I'm undecided whether this is necessarily a good thing in general. +1 for the comment. Dance of Venus (and variations) in TikZ/PGF. Modern software however supports any kind of naming scheme. Special characters other than underscore (_) are not supported. Pascal/camel case for table names might lead to some issues. Especially with MySql when you run it on windows everything become from. Singular vs Plural? Auto-rename all Query columns e.g. But given the limitations of some SQL dialects, or the fact that after joining, two names may easily conflict, I've found the above two tools very useful in the past: 1) Prefixing identifiers with a hint about their object types, 2) Establishing a standard for aliasing tables, and always alias column names accordingly. 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. Why is my table not fully recognized by the Query pane in SSMS? its works fine. Most SQL databases support only a 3-4 layered set of namespaces: In any case, there is no such concept as package ("schema") hierarchies as there is in languages like Java, which makes namespacing in SQL quite tricky. Still Confused About Identifying vs. Non-Identifying Relationships, Table and column naming conventions when plural and singular forms are odd or the same. I've never heard it called "CapitalCase" in my 30 years experience. To learn more, see our tips on writing great answers. Can we create a table with a space in name in MySQL? So here underscore goes better. In the SQL language, it is mostly easy to distinguish between them by qualifying them. See the original article here. A hyphen is not a legal character in a sql column so it needs to be masked. This wouldn't break the above naming suggestions - just a few more things to account for. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Another technique that I've found very useful in the past is a standard approach to aliasing things. What's in a Name: Java Naming Conventions? There are two wildcards often used in conjunction with the LIKE operator: % - The percent sign represents zero, one, or multiple characters _ - The underscore represents a single character How to create a LATEX like logo using any word at hand? Case insensitive nature of SQL supports Underscores_Scheme. @SinthiaV I don't know about others but in our case since we're using a JS ORM (regrettably) the options were 1) break convention by using camelCase in the db 2) break convention by using snake_case in JS 3) map camelCase in JS to snake_case in db. 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. 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