Knowledge in Mysql_database on viden.io

Knowledge in Mysql_database

DBMS INDEXING AND HASHING

Students of computer science, studying subject databases can refer to the notes below for reference and examination purpose. The attatchment includes topics of DBMS indexing and hashing such as Basic Concepts, Ordered Indices, B+-Tree Index Files, B-Tree Index Files, Static Hashing, Dynamic Hashing, Comparison of Ordered Indexing and Hashing, Index Definition in SQL, Multiple-Key Access, etc.

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MySQL Functions

MySQL Functions MySQL has many built-in functions. This reference contains string, numeric, date, and some advanced functions in MySQL. ________________________________________

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yash sharma

SQL Comments

SQL Comments Comments are used to explain sections of SQL statements, or to prevent execution of SQL statements. Note: The examples in this chapter will not work in Firefox and Microsoft Edge! Comments are not supported in Microsoft Access databases. Firefox and Microsoft Edge are using Microsoft Access database in our examples. ________________________________________ Single Line Comments Single line comments start with --. Any text between -- and the end of the line will be ignored (will not be executed).

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yash sharma

SQL FOREIGN KEY Constraint

SQL FOREIGN KEY Constraint A FOREIGN KEY is a key used to link two tables together. A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table. The table containing the foreign key is called the child table, and the table containing the candidate key is called the referenced or parent table.

SQL FOREIGN KEY Constraint +6 more

yash sharma

SQL Hosting

SQL Hosting If you want your web site to be able to store and retrieve data from a database, your web server should have access to a database-system that uses the SQL language. If your web server is hosted by an Internet Service Provider (ISP), you will have to look for SQL hosting plans. The most common SQL hosting databases are MS SQL Server, Oracle, MySQL, and MS Access. ________________________________________

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yash sharma

SQL JOIN

SQL JOIN A JOIN clause is used to combine rows from two or more tables, based on a related column between them. Let's look at a selection from the "Orders" table: Then, look at a selection from the "Customers" table: Notice that the "CustomerID" column in the "Orders" table refers to the "CustomerID" in the "Customers" table. The relationship between the two tables above is the "CustomerID" column

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yash sharma

SQL PRIMARY KEY Constraint

SQL PRIMARY KEY Constraint The PRIMARY KEY constraint uniquely identifies each record in a table. Primary keys must contain UNIQUE values, and cannot contain NULL values. A table can have only ONE primary key; and in the table, this primary key can consist of single or multiple columns (fields).

SQL PRIMARY KEY Constraint +6 more

yash sharma