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Articles by George John
Page 74 of 79
MySQL UPDATE the corresponding column with random number between 1-3?
For random numbers in a range, you need to use the RAND() method from MySQL. The syntax is as follows for update −UPDATE yourTableName set yourColumnName=value where yourColumnName2=(SELECT FLOOR(1+RAND()*3));In the above query, the statement FLOOR(1+RAND()*3) generates the number between 1-3 and update the column.To understand the above syntax, let us first create a table. The query to create a table is as follows −mysql> create table updateRowWith1To3 -> ( -> Id int, -> Name varchar(100) -> ); Query OK, 0 rows affected (0.47 sec)Insert some records in the ...
Read MoreCalculate age based on date of birth in MySQL?
Calculate Age based on date of birth with the help of DATE_FORMAT() method in MySQL. Firstly, get the current date time with the help of now() method and you can place your date of birth in DATE_FORMAT().The syntax is as follows −SELECT DATE_FORMAT(FROM_DAYS(DATEDIFF(now(), 'yourDateofbirth')), '%Y')+0 AS anyVariableName;Apply the above syntax to calculate age from yourDateofbirth. In the above syntax, replace yourDateofbirth with your date of birth. The query is as follows −SELECT DATE_FORMAT(FROM_DAYS(DATEDIFF(now(), '2010-11-25')), '%Y')+0 AS Age;The following is the output −+------+ | Age | +------+ | 8 | +------+ 1 row in set (0.00 sec)Let ...
Read MoreMySQL Server port number?
If you will install MySQL on your system, then you will get the default MySQL server port number i.e. 3306.To know the MySQL server port number, you can use the following query. Here, we have used the SHOW VARIABLES command. The query is as follows −mysql> SHOW VARIABLES WHERE Variable_Name = 'port';The following is the output −+---------------+-------+ | Variable_Name | Value | +---------------+-------+ | port | 3306 | +---------------+-------+ 1 row in set (0.04 sec)
Read MoreMySQL - CAST DECIMAL to INT?
Cast DECIMAL to INT with the help of FLOOR() function. The syntax is as follows −SELECT FLOOR(yourColumnName) from yourTableName where condition;Let us first create a table. The following is the query to create a table.mysql> create table DecimalToIntDemo -> ( -> Amount DECIMAL(3, 1) -> ); Query OK, 0 rows affected (0.88 sec)Now you can insert records into the table with the help of insert command. The query is as follows −mysql> insert into DecimalToIntDemo values(12.5); Query OK, 1 row affected (0.23 sec) mysql> insert into DecimalToIntDemo values(50.4); Query OK, 1 ...
Read MoreWhy we mention in MySQL WHERE 1=0?
The condition 1=0 can be used to stop the query from returning any rows. It returns empty set.The syntax is as follows:SELECT *FROM yourTableName WHERE 1=0;To understand the above syntax, let us create a table. The query to create a table is as follows:mysql> create table ConditionDemo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Name varchar(10), -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command. The query is as follows:mysql> insert into ConditionDemo(Name) values('Larry'); Query OK, 1 row affected (0.10 sec) mysql> ...
Read MoreHow do I add to each row in MySQL?
You can add a value to each row in MySQL using UPDATE command.Let us see when your column is an integer. The syntax is as follows:UPDATE yourTableName SET yourIntegerColumnName = yourIntegerColumnName+anyValue; UPDATE yourTableName SET yourIntegerColumnName = anyValue WHERE yourIntegerColumnName IS NULL;You can add a value for a date column name. The syntax is as follows:UPDATE yourTableName SET yourDateColumnName = DATEADD(yourDateColumnName, INTERVAL anyIntegerMonth)To understand the above syntax, let us create a table. The query to create a table is as follows:mysql> create table addEachRowValue -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Amount int, -> ShippingDate ...
Read MoreLazy loading of images in table view using Swift
To load an image in table view cell we’ll go through a series of steps.Create a table view, table view cell and add an Image view to it.Assign a custom class to the cell we created.In the cell for row at method write the following lines of code.let cell = tblView.dequeueReusableCell(withIdentifier: "CustomCell") as! CustomCell return cellTo download the image we’ll create a function and embed that into an extension.func setImageFromUrl(ImageURL :String) { URLSession.shared.dataTask( with: NSURL(string:ImageURL)! as URL, completionHandler: { (data, response, error) -> Void in DispatchQueue.main.async { if let ...
Read MoreChange value from 1 to Y in MySQL Select Statement?
You can use IF() from MySQL to change value from 1 to Y. The syntax is as follows:SELECT IF(yourColumnName, ’Y’, 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 changeValuefrom1toY -> ( -> Id int NOT NULL AUTO_INCREMENT, -> isValidAddress tinyint(1), -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.76 sec)Now you can insert some records in the table using insert command. The query is as follows:mysql> insert into changeValuefrom1toY(isValidAddress) values(1); Query OK, 1 row affected (0.22 ...
Read MoreHow can I get the current screen orientation in Android?
In some situation, we need to find an android activity orientation. This example demonstrates how to integrate Android Login and registration form.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 taken a text view. According to screen orientation, text view going to update the text.Step 3 − Add the following code to src/MainActivity.javapackage com.example.andy.myapplication; import android.content.res.Configuration; import android.os.Build; import android.os.Bundle; import android.support.annotation.RequiresApi; import android.support.v7.app.AppCompatActivity; import android.widget.TextView; ...
Read MoreHow to convert Varchar to Double in SQL?
You can convert varchar to double using CAST() function. The syntax is as follows:SELECT yourColumnName1, yourColumnName2, ......N, CAST(yourColumnName AS DECIMAL(TotalDigit, DigitAfterDecimalPoint)) anyVariableName FROM yourtableName ORDER BY anyVariableName DESC;To understand the above syntax, let us create a table. The query to create a table is as follows:mysql> create table VarcharToDouble -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Name varchar(10), -> Amount varchar(10) , -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command. The query is as follows:mysql> insert into VarcharToDouble(Name, Amount) values('John', ...
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