Categories
MySQL

MySQL IN Operator

Using IN operator in MySQL you can match the value from a set of values or a subquery. Example of MySQL IN: SELECT * FROM user WHERE country IN (‘IN’,’AUS’); Here both the user from IN and AUS will be shown in the result. You can also check for exception like: SELECT * FROM user […]

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Css Css3

em vs px

The most confusing part of CSS styling is that font-size attribute i.e. how this will show in various resolutions. em: This scalable unit is used in web document media due to scalability and their mobile-device-friendly environment. For instance one em is equal to current font-size i.e. if font-size of the document is 10pt then 1em […]

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Html

Links in HTML

To create any links in HTML internal or external <a> element is used. Clicking on this link user goes to another page or another external url. Normal links looks like: <a href=”http://www.example.com”>Click here</a> You can parameters too: <a href=”http://www.example.com?param1=100&param2=200″>Click here</a> Note to remember that parameters are separated by (&) after each parameter value. To open […]

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Creative blog

Choose the right blog topic

The first thing before writing a blog is choose a blog topic that suitable for you to build a successful blog. So do not make any mistake by choosing a wrong topic. So while creating a blog first ask yourself that “What topic should I choose?” or “What topic I am capable to write?”This is […]

Categories
Html

HTML Tables

In html there are set of elements that are needed to create tables. Table can be created using <table> element.Each row of a tables are defines via <tr> element and each cell are defines via <td> element within <tr> element. So a basic structure of a table looks like: <table> <tr> <td>Cell</td> <td>Cell</td> </tr> <tr> […]

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Css Css3

Knowing !important

Using !important rules can be a dangerous way to style your webpage that usually means you are forcefully doing this, but they exist for some reason. The paragraph will be colored red, even there is a ID selector that has higher priority. So, the this rule overrides all the particular property. An !important rule works […]

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MySQL

MySQL ALTER TABLE, DROP TABLE

To change the structure of a table you use ALTER TABLE statement. This allows you to add or drop column, change data type, rename table etc. Example of ALTER TABLE: ALTER TABLE table_name CHANGE COLUMN table_id table_id INT(11) NOT NULL AUTO_INCREMENT; To remove existing table you need to use DROP TABLE statement as below: Example […]

Categories
MySQL

MySQL Views

A database view is a virtual table which is defined as a SQL select query with JOIN statement. Same as database table it consists of rows and columns. When any data of a tables changes, the corresponding view reflects that changes as well. Advantages: A database view allows you to simplify complex queries. You do […]

Categories
MySQL

Data Types – MySQL

MySQL supports different data types while creating columns i.e. what type of value is using for the column or fixed/variable length etc. It has different types of data types i.e. Numeric: TINYINT, SMALLINT, MEDIUMINT, INT, BIGINT, DECIMAL, FLOAT, DOUBLE, BIT String: CHAR, VARCHAR, BINARY, VARBINARY, TINYBLOB, BLOB, MEDIUMBLOB, LONGBLOB, TINYTEXT, TEXT, MEDIUMTEXT, LONGTEXT, ENUM, SET […]

Categories
MySQL

Use DISTINCT to eliminate duplicate rows

In a table there may be data available i.e. duplicate. Each time you querying and get all the duplicate data. Use DISTINCT to avoid it. Suppose in a coountry table there are two same country name the using DISTINCT you will get the only one name for each country. SELECT DISTINCT country_name FROM table_country;