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Articles by karthikeya Boyini
Page 81 of 143
Compare two tables and return missing ids in MySQL?
To compare two tables and return missing ids, you need to use a subquery. The syntax is as follows −SELECT yourFirstTableName.yourIdColumnName FROM yourFirstTableName WHERE NOT IN(SELECT yourSecondTableName.yourIdColumnName FROM youSecondTableName);To understand the above syntax, let us create a table with sample fields and then we will insert records. The query to create the first table −First_Tablemysql> create table First_Table -> ( -> Id int -> ); Query OK, 0 rows affected (0.88 sec)Now insert some records in the table using insert command. The query is as follows −mysql> insert into First_Table values(1); Query OK, 1 row affected (0.68 ...
Read MoreHow to covert ConcurrentLinkedQueue to array in android?
Before getting into example, we should know what ConcurrentLinkedQueueis, it is unbounded queue based on linked nodes. Multiple threads can access queue elements with safety. Elements travel based on queue strategy as FIFO and elements going to insert from tail. It does not allow null values.This example demonstrate about How to covert ConcurrentLinkedQueue to array in androidStep 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 ...
Read MoreHow to check element is available in android ConcurrentLinkedDeque?
Before getting into example, we should know what ConcurrentLinkedDequeis, it is unbounded deque based on linked nodes. Multiple threads can access deque elements with safety.This example demonstrate about How to check element is available in android ConcurrentLinkedDequeStep 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 text view to showConcurrentLinkedDequeelements.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.os.Build; import android.os.Bundle; import android.support.annotation.RequiresApi; ...
Read MoreHow to add first element in android ConcurrentLinkedDeque?
Before getting into example, we should know what ConcurrentLinkedDequeis, it is unbounded deque based on linked nodes. Multiple threads can access deque elements with safety.This example demonstrate about How to add first element in android ConcurrentLinkedDequeStep 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 text view to showConcurrentLinkedDequeelements.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.os.Build; import android.os.Bundle; import android.support.annotation.RequiresApi; import ...
Read MoreHow to find the minimum values of two or more fields in MySQL?
To find the minimum values of two or more fields, use LEAST() function from MySQL −select least(yourColumnName1, yourColumnName2, ...N) from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> Date1 date, -> Date2 date, -> Date3 date -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-03-31', '2019-01-01', '2019-03-05'); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+------------+------------+------------+ | Date1 | Date2 | Date3 ...
Read MoreMySQL query to split a column after specific characters?
To split a column after specific characters, use the SUBSTRING_INDEX() method −select substring_index(yourColumnName, '-', -1) AS anyAliasName from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> StreetName text -> ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Paris Hill St.-CA-83745646') ; Query OK, 1 row affected (0.32 sec) mysql> insert into DemoTable values('502 South Armstrong Street-9948443'); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+------------------------------------+ | ...
Read MoreCopy a few columns from a table to another in MySQL
Let us first create a table −mysql> create table DemoTable1 -> ( -> Id int, -> Name varchar(100) -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(10, 'John'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable1 values(11, 'Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1 values(12, 'Robert'); Query OK, 1 row affected (0.32 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+------+--------+ | Id ...
Read MoreOrder by number of chars in MySQL?
To order by number of chars, use ORDER BY and LENGTH() method. Following is the syntax −select *from yourTableName order by LENGTH(yourColumnName) DESC;Let us first create a table −mysql− create table DemoTable -> ( -> Name varchar(100) -> ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Robert'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Bob'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable ...
Read MoreHow to set default Field Value in MySQL?
To set default field value, use the “default”. Let us first create a table −mysql> create table DemoTable -> ( -> Age int -> ); Query OK, 0 rows affected (0.58 sec)Here is the query to set default field value in MySQL −mysql> alter table DemoTable MODIFY Age int default 18; Query OK, 0 rows affected (0.25 sec) Records: 0 Duplicates: 0 Warnings: 0Now you can check the table description −mysql> desc DemoTable;OutputThis will produce the following output −+-------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+---------+------+-----+---------+-------+ | Age ...
Read MoreHow to select everything before @ in an email-id with in MySQL?
Use SUBSTRING_INDEX to select everything before @ in an email-id −select substring_index(yourColumnName, '@', 1) from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> EmployeeMailId varchar(100) -> ); Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Larry123@gmail.com'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('987Sam@hotmail.com'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('123456David_98@gmail.com'); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the ...
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