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Articles by George John
Page 72 of 79
Sum values of a single row in MySQL?
You can use below syntax to sum values of a single row −Case 1 − The following is the syntax if your column does not have NULL value −SELECT yourColumnName1+yourColumnName2+yourColumnName3+.......+N as anyVariableName FROM yourTableName;Case 2 − If your column has NULL value then use this syntax −SELECT IFNULL(yourColumnName1, 0)+ IFNULL(yourColumnName2, 0)+ IFNULL(yourColumnName3, 0)+.............+N 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 SumValueOfSingleRow -> ( -> Id int NOT NULL AUTO_INCREMENT, -> FirstValue int, -> SecondValue int, -> ThirdValue ...
Read MoreMySQL's now() +1 day?
The statement now()+1 day itself states that we need to add a day to the current datetime. You can write the above logic like this −now()+interval 1 day;Or you can write same logic with date_add() function from MySQL like this −date_add(now(), interval 1 day);Let us use the above concept with MySQL select statement. The query is as follows −mysql> select now()+ interval 1 day;Here is the sample output that increments a day by 1 −+-----------------------+ | now()+ interval 1 day | +-----------------------+ | 2018-11-23 15:43:10 | +-----------------------+ 1 row in set (0.05 sec)Now, let us see another example ...
Read MorePerforming a MySQL LIKE comparison on an INT field?
You need to use cast() method to perform comparison on an INT field. The syntax is as follows −SELECT yourColumnName1, yourColumnName2, ......N yourTableName WHERE CAST(yourColumnName as CHAR) LIKE ‘%yourIntegerValue%’;To understand the above syntax, let us create a table. The following is the query to create a table for performing a LIKE comparison on INT field −mysql> create table ComparisonOnIntField -> ( -> StudentId int NOT NULL, -> StudentName varchar(20), -> StudentAge int -> ); Query OK, 0 rows affected (1.00 sec)Insert some records in the table to perform a MySQL LIKE comparison on an INT ...
Read MoreShould I use COUNT(*) to get all the records in MySQL?
Whenever you want all the values like not null for a column then use count(*). This is faster than using count() method.The syntax to use count(*) is as follows −select count(*) as anyVariableName from yourTableName;To understand the above concept, let us first create a table. The query to create a table is as follows −mysql> create table CountingDemo -> ( -> BookId int -> ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into CountingDemo values(100); Query OK, 1 row affected (0.13 sec) ...
Read MoreDoes MySQL Boolean "tinyint(1)" holds values up to 127?
Let us learn some points about TINYINT type in MySQL −The TINYINT type takes 1 byte i.e. 8 bits.The TINYINT(N), where N indicates the display width you want.For example, TINYINT(1) can be used to display width which is 1.Let us learn about the minimum and maximum values −The maximum value for tinyint is= (2(8-1)-1) = 127 The minimum value for tinyint is = -(2(8-1)) = -128.The value will be between -128 to 127. This means TINYINT (1) does not affect the maximum and minimum value of tinyint.Let us check it −Firstly, create a table with a column set as TINYINT ...
Read MoreHow to create Animated Gradient Background in android.
Before getting into example, we should know what is Gradient color. According to Wikipedia, In computer graphics, a color gradient (sometimes called a color ramp or color progression) specifies a range of position-dependent colors, usually used to fill a region. For example, many window managers allow the screen background to be specified as a gradient.This example demonstrate about how to create Animated Gradient Background in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. ...
Read MoreHow to find out number of days in a month in MySQL?
To find the number of days in month, use the below syntax.select DAY(LAST_DAY(yourColumnName)) as anyVariableName from yourTableName;To understand the above syntax, let us first create a table. The query to create a table is as follows.mysql> create table DaysInaGivenMonth -> ( -> MonthName datetime -> ); Query OK, 0 rows affected (1.62 sec)Insert some records in the table using insert command. The query is as follows.mysql> insert into DaysInaGivenMonth values(now()); Query OK, 1 row affected (0.24 sec) mysql> insert into DaysInaGivenMonth values(date_add(now(), interval -1 month)); Query OK, 1 row affected (0.16 sec) mysql> insert into DaysInaGivenMonth values(date_add(now(), interval ...
Read MoreHow to get the absolute coordinates of a view in Android?
Before getting into example, we should know what is absolute coordinates. It means absolute position (x, y)of a view on window manager. This example demonstrate about how to get the absolute coordinates of a view.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above xml, we have given one Textview. when user click on textview, it will show the position of the view on Toast.Step 3 − Add the following ...
Read MoreHow to switch between hide and view password in Android
There are so many cases, it required to show password while entering password or after entered password. This example demonstrate about How to switch between hide and view password.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code we have given two TextInputEditText ...
Read MoreHow to select max of mixed string/int column in MySQL?
To select max of mixed string/int column, you need to use substring() function. The syntax is as follows:SELECT MAX(CAST(SUBSTRING(yourColumnName, 4, length(yourColumnName)-3) AS UNSIGNED)) 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 StringIntMixHighestDemo -> ( -> InvoiceId int NOT NULL AUTO_INCREMENT, -> InvoiceNumber varchar(20), -> PRIMARY KEY(InvoiceId) -> ); Query OK, 0 rows affected (0.65 sec)Now you can insert some records in the table using insert command. The query is as follows:mysql> insert into StringIntMixHighestDemo(InvoiceNumber) values('INV129'); Query OK, 1 row ...
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