Create Table SQL
"Create Table SQL" is a command used in SQL (Structured Query Language) to create a new table in a database. It specifies the table name and the columns it will contain, along with their data types and any constraints. This command is essential for defining the structure of a database and organizing data in a meaningful way.
3 Key excerpts on "Create Table SQL"
eBook - ePub- empreender(Author)
- 2020(Publication Date)
- Bibliomundi(Publisher)
...Developing Your AI Skills – Using SQL If you want to ensure you aren’t left behind by developments in AI and machine learning, then it may pay to learn relevant skills that you can use to implement your own strategies. At least by understanding the tools used in AI and machine learning, you will be able to navigate these new horizons and make smarter decisions for your business. One of the key concepts to understand then is SQL. SQL stands for Structured Query Language, and is a declarative language that is used to store and retrieve information from a database. If that sounds like gobbledygook, it basically provides a set of commands you can use to manipulate large data sets. SQL is crucial for data science and machine learning. It takes a number of forms such as MySQL, SQL Se rver, and SQLite. Each uses a slightly different dialect to achieve the same thing: interact with relational databases. Relational databases consist of numerous tables like you see in Excel, with columns and rows. So if you had a list of visitors to your website, you might fill out their data across rows, such as name, age, contact details, etc. Pull out any given visitor, and it will bring their details up so that you’re ready to call them and market to them. SQL then allows you to do things like creating whole new tables, or inserting new rows, columns, or cells. You can do this with simple commands like “CREATE TABLE” and “INSERT INTO.” To make a new database, you first need to use a command to make it, and from there you can then begin inserting tables like so: CREATE TABLE CLIENTS (ROWID INTEGER PRIMARY KEY, LASTNAME TEXT, FIRSTNAME TEXT, PHONE TEXT, EMAIL TEXT); One of the more powerful commands is something called SELECT which will allow you to retrieve information across one or more tables...
eBook - ePub- Janet Valade(Author)
- 2009(Publication Date)
- For Dummies(Publisher)
...(For a more complete description of the MySQL server, see Chapter 1.) The next two sections detail how to do this. Building SQL queries SQL (Structured Query Language) is the computer language that you use to communicate with MySQL. SQL is almost English; it’s made up largely of English words, put together into strings of words that sound similar to English sentences. In general (fortunately), you don’t need to understand any arcane technical language to write SQL queries that work. The first word of each query is its name, which is an action word (a verb) that tells MySQL what you want to do. The queries that I discuss in this chapter are CREATE, DROP, ALTER, SHOW, INSERT, LOAD, SELECT, UPDATE, and DELETE. This basic vocabulary is sufficient to create — and interact with — databases on Web sites. The query name is followed by words and phrases — some required and some optional — that tell MySQL how to perform the action. For instance, you always need to tell MySQL what to create, and you always need to tell it which table to insert data into or to select data from. The following is a typical SQL query. As you can see, it uses English words: SELECT lastName FROM Member This query retrieves all the last names stored in the table named Member. More complicated queries, such as the following, are less English-like: SELECT lastName,firstName FROM Member WHERE state=”CA” AND city=”Fresno” ORDER BY lastName This query retrieves all the last names and first names of members who live in Fresno California and then puts them in alphabetical order by last name. This query is less English-like but still pretty clear. Here are some general points to keep in mind when constructing an SQL query, as illustrated in the preceding sample query: Capitalization: In this book, I put SQL language words in all caps; items of variable information (such as column names) are usually given labels that are all or mostly lowercase letters...
- Robert C. Hughes(Author)
- 2018(Publication Date)
- Chapman and Hall/CRC(Publisher)
...SQL, the common communication language in RDMSs, became a standard of ANSI in 1986 and of the International Organization for Standardization (ISO) in 1987 (International Organization for Standardization 2016). Since then, the standard has gone through many revisions to include an expanding feature group. SQL Language Standards including Data Types are included in the ANSI SQL Standard. Despite the existence of such standards, most SQL code is not completely portable among different RDMS vendors due to their own extensions to the SQL Standard for language components, including Data Types. Data Types have a natural validation effect on Data Base Record activity in that data entered into records cannot violate the Data Type. For example, it is not possible to enter alpha characters into a numeric field. The RDMS engine would automatically reject such an attempt. SQL SQL is the main communication language with RDMSs for creating and managing databases, maintaining databases, and for retrieving information from databases. SQL has three main language components, Data Definition Language (DDL), Data Manipulation Language (DML), and Data Control Language (DCL). DDL DDL is the part of SQL that is used to create and change database structures, including Database Schemas, Tables, Columns, Views, and related objects. Data Design and Modeling Tools such as Oracle SQL Developer Data Modeler provide utilities to automatically generate DDL for deployment of Database Designs directly to a live RDMS Instance. In addition, Data Modeler Systems usually support a number of different Vendor RDMS targets with their own specific DDL variations in terms of SQL grammar and Data Types...
