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17 Αυγ 2023 · SELECT first_name, last_name FROM employees ORDER BY last_name; Explanation. We again select employees’ first and last names. But now we want to sort the output in a specific way. In this example, it’s by employees’ surname. To do that, we use ORDER BY. In it, we simply write the column name.
16 Απρ 2024 · Database naming conventions are the rules for naming diverse elements within a database: tables, columns, indexes, constraints, and various other objects. Although there are various conventions in practice, we can formulate general guidelines and principles.
9 Αυγ 2021 · PostgreSQL naming conventions provide guidelines for naming database object names in PostgreSQL, including tables, columns, indexes and constraints. In this article, We will learn about essential naming conventions such as PostgreSQL table naming, index naming and primary key naming to promote best
SQL Aliases. SQL aliases are used to give a table, or a column in a table, a temporary name. Aliases are often used to make column names more readable. An alias only exists for the duration of that query. An alias is created with the AS keyword.
28 Ιουλ 2020 · When naming tables, you have two options – to use the singular for the table name or to use a plural. My suggestion would be to always go with names in the singular. If you’re naming entities that represent real-world facts, you should use nouns. These are tables like employee, customer, city, and country.
I recommend checking out Microsoft's SQL Server sample databases: https://github.com/Microsoft/sql-server-samples/releases/tag/adventureworks. The AdventureWorks sample uses a very clear and consistent naming convention that uses schema names for the organization of database objects. Singular names for tables; Singular names for columns
16 Φεβ 2014 · Ex: Use first_name, not "First_Name". Data types are not names . Database object names, particularly column names, should be a noun describing the field or object.
