SQL Basic Commands
The SQL SHOW statement displays information contained in the database and its tables. This helpful tool lets you keep track of your database contents and remind yourself about the structure of your tables.
For example, the SHOW DATABASES command lists the databases managed by the server.
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SHOW DATABASES;
The SHOW TABLES command is used to display all of the tables in the currently selected MySQL database.
SHOW COLUMNS displays information about the columns in a given table.
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The following example displays the columns in our customers table:
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SHOW COLUMNS FROM customers;
SHOW COLUMNS displays the following values for each table column:
Field: column name
Type: column data type
Key: indicates whether the column is indexed
Default: default value assigned to the column
Extra: may contain any additional information that is available about a given column.
SELECT Statement
The SELECT statement is used to select data from a database.
The result is stored in a result table, which is called the result-set.
A query may retrieve information from selected columns or from all columns in the table.
To create a simple SELECT statement, specify the name(s) of the column(s) you need from the table.
Syntax of the SQL SELECT Statement:
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SELECT column_list FROM table_name;
– column_list includes one or more columns from which data is retrieved
– table-name is the name of the table from which the information is retrieved
Below is the data from our customers table:
The following SQL statement selects the FirstName from the customers table:
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SELECT FirstName,LastName FROM customers;
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The SQL cheat sheet is a document that provides you with the most commonly used SQL statements, basic clauses and shows you how to write different conditions.
SQL Cheat Sheet includes the most commonly required keywords, data types, operators, functions, indexes, keys, and lots more that you might need while using SQL
There are various precautions you may take but detecting it at an early stage and then resolving it, is the best way to go.
If you are a user or even an administrator then your life is not that easy every time.
The only way is to understand reasons, causes, precautions you may take and the solutions that can help you resolving SQL database page level corruption.
Reasons Of SQL Server Page Level Corruption
SQL database stores its data in pages so the basic unit of storage is a page in SQL database server.
Because it is simple and quite easy to fix SQL database corruption issues by repairing individual pages.
Structured Query language (SQL) or sometimes called “See-Quel” is a query language used to deal with Relational Databases.
Whether you want to edit or retrieve information in your database - SQL is your go-to language.
That is one of the reasons why SQL Certification is so widely popular these days.
SQL has roots dating back to the early 1970s, which makes it really old.
But you can still find being widely used among all big names in the tech world.
Reasons to learn SQL - Easy To Learn - It is used to retrieve, manage and access data present in the databases.
