Which of the following do you need to consider when you make a table in sql

Related Questions • What is the full form of SQL? • What is DDL command stands for? • Which of the following is not a DDL command? • Which of the following is not a valid SQL type? • Which of the following are TCL commands? • Which is not a category of SQL command. • Which of the following do you need to consider when you make a table in SQL? • Which of the following SQL clauses is used to DELETE tuples from a database table? • Which operator is used to compare a value to a specified list of values? • How many Primary keys can have in a table?

It's fairly general question, but I'd like to know what do you use in determination of primary key of the table. Examples supplied with you reasoning are highly desired. I noticed that many programmers add ID column and use it as a primary key. I think, it is flawed from design point of view, as ID in that case HAS NOTHING TO DO WITH THE TABLE. @enigma, you want to know what "the best is", well here it is: it depends on a lot of factors. different situations require differnt setups of keys. if it was easy, there would be one simple way of picking them. that said, being able to identify, evaluate and give precedence to those factors is where experience and knowlege come into play. database design is an art just as much as a science. The role of a primary key is to uniquely identify each row in your table. If no column or set of columns matches this requirement, an column containing a unique id is often added as a primary key. I do not agree with your comment about programmers adding an id that has nothing to do with table data. When you need to link data across several tables, a concise id is easier to use than a compound key. If a table does not have a column or set of columns which uniquely identify any given row then the data model is almost certainly flawed. Certainly a surrogate key is often more convenient than a compound key (especially when interacting with ORM tools) but it is a supplement to, not a substitute for, a properly identified business key. Note that the ...

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In this article Applies to: This article provides information about best practices and guidelines that help establish security for SQL Server. For a comprehensive review of SQL Server security features, see For specific product security best practices, see Overview A layered security methodology provides a defense-in-depth solution by leveraging multiple security capabilities targeted at different security scopes. The security features made available in SQL Server 2016, and improved in subsequent releases, help counter security threats and provide well-secured database applications. Azure complies with several industry regulations and standards that can enable you to build a compliant solution with SQL Server running in a virtual machine. For information about regulatory compliance with Azure, see Column-level protection Organizations often need to protect data at the column level as data regarding customers, employees, trade secrets, product data, healthcare, financial, and other sensitive data is often stored in SQL Server databases. Sensitive columns often include identification/social security numbers, mobile phone numbers, first name, family name, financial account identification, and any other data that could be deemed personally identifiable information (PII). The methods and features mentioned in this section raise the level of protection at the column level with minimal overhead, and without requiring extensive changes to application code. Use Use You can also - A...

Creating tables in databases is a very helpful skill, and not just for software engineers or database administrators. It allows you to design or change the structure of a database and store data that’s related to each other. In this article, you’ll learn what a database table is, who creates them, and how to use the syntax of the CREATE TABLE command. What Is a Database Table? A relational database is built of various structures like tables, views, procedures, and triggers. The main element in a database is the table. It’s a structure that actually stores data. In most cases, a database contains more than one table and the tables are related to each other (i.e. tables store related information, like a person’s name, eye color, and height). The picture below shows a sample of a database for an online musical equipment shop. (The image comes from the Vertabelo blog; Vertabelo is an online database modeling tool.) Notice that this database has several tables. The lines indicate relationships between tables: As you see, there are a lot of tables: category, instrument, manufacturer, and more. In a SQL database, every table has a name and stores data in rows and columns. Each row stores details about a specific object. For example, the table instrument stores information about instruments. Each row is a specific instrument: one row can store information about a white guitar purchased from “Music Shop in Chicago”; another row can store info about a silver drum purchased from “In ...

• • SQL Introduction • SQL Introduction • SQL SELECT (I) • SQL SELECT • SQL AND, OR, NOT • SQL SELECT DISTINCT • SQL SELECT AS • SQL LIMIT, TOP, FETCH FIRST • SQL IN Operator • SQL BETWEEN Operator • SQL IS NULL and NOT NULL • SQL MIN() and MAX() • SQL COUNT() • SQL SUM() and AVG() • SQL SELECT (II) • SQL ORDER BY • SQL GROUP BY • SQL LIKE • SQL Wildcards • SQL UNION • SQL Subquery • SQL ANY and ALL • SQL CASE • SQL HAVING • SQL EXISTS • SQL JOIN • SQL JOIN • SQL INNER JOIN • SQL LEFT JOIN • SQL RIGHT JOIN • SQL FULL OUTER JOIN • SQL DATABASE & TABLE • SQL Create Database • SQL Create Table • SQL Drop Database • SQL Drop Table • SQL Alter Table • SQL Backup Database • SQL Insert, Update and Delete • SQL Insert Into • SQL Update • SQL Select Into • SQL Insert Into Select • SQL Delete and Truncate Rows • SQL Constraints • SQL Constraints • SQL Not Null Constraint • SQL Unique Constraints • SQL Primary Key • SQL Foreign Key • SQL Check • SQL Default • SQL Create Index • SQL Additional Topics • SQL Data Types • SQL Date and Time • SQL Operators • SQL Comments • SQL Views • SQL Stored Procedures • SQL Injection A database table is used to store records (data). To create a database table, we use the SQL CREATE TABLE statement. Example -- create a table Companies with name, id, address, email, and phone number CREATE TABLE Companies ( id int, name varchar(50), address text, email varchar(50), phone varchar(10) ); Here, the SQL command creates a table named Companies with the colu...