Use the CSS :invalid selector to style all elements with an invalid value. You can try to run the following code to implement the :invalid selectorExampleLive Demo                    input:invalid {             background: red;          }                     Heading                    The style (red color background) appears if you type an irrelevant/ invalid email address.    

To style every enabled element, use the CSS :enabled selector.ExampleYou can try to run the following code to style enabled elementLive Demo                    input:enabled {             background: blue;          }                              Subject          Student:          Age:          

Indentation is an important feature of Python syntax. Code blocks in function, class or loops are required to follow same indent level for statements in it. The tabnanny module in Python's standard library is able to detect any violation in this stipulation.This module is primarily intended to be used in ... Read More

To overlap elements, use the CSS z-index property. You can try to run the following code to implement the z-index property and set image behind the textExampleLive Demo                    img {             position: absolute;             left: 0px;             top: 0px;             z-index: -1;          }                           This is demo text.    

To update an entire row in MySQL, use UPDATE command. You need to know the primary key column. The syntax is as follows to update an entire row.UPDATE yourTableName SET yourColumnName1 = ’yourValue1’ ,yourColumnName2 = ’yourValue2’ ,    yourColumnName3 = ’yourValue3’ ,.......................N    WHERE yourPrimaryKeyColumnName = yourValue;To understand the above ... Read More

You can use DISTINCT with RLIKE operator to find a list of city names that do not start with vowels.The syntax is as follows −SELECT DISTINCT yourCityColumnName FROM yourTableName WHERE yourCityColumnName NOT RLIKE ‘ ^[AEIOUaeiou].*$’;To understand the above syntax, let us create a table. Here, we have a column for ... Read More

To convert the date time to a number in MySQL, the syntax is as follows −SELECT UNIX_TIMESTAMP(yourColumnName) as anyVariableName FROM yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table DateTimeToNumberDemo    -> (    -> Id int ... Read More

Convert dd/mm/yyyy string to Unix timestamp with the help of UNIX_TIMESTAMP(). The syntax is as follows −SELECT UNIX_TIMESTAMP(STR_TO_DATE(yourColumnName, '%d/%m/%Y')) as anyVariableName FROM yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table ConvertddmmyyyyInUnixTimeStamp    -> (    -> ... Read More

You can update boolean value using UPDATE command. If you use the BOOLEAN data type, MySQL internally convert it into tinyint(1). It can takes true or false literal in which true indicates 1 to tinyint(1) and false indicates 0 to tinyint(1).The syntax is as follows −UPDATE yourTableName SET yourColumnName = ... Read More

The best data type for currencies in MySQL is a DECIMAL. The syntax of DECIMAL data type is as follows −DECIMAL(TotalDigit, NumberOfDigitAfterDecimalPoint);To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table CurrenciesDemo    -> (    -> TotalPrice ... Read More