Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
If you will extend the size of a varchar field in MySQL then it won’t affect the data inside it.Let us first create a table −mysql> create table DemoTable( Name varchar(8) ); Query OK, 0 rows affected (1.11 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Robert'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Mike'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Sam'); Query OK, 1 row affected (0.13 sec)Display all records from the ... Read More
Here we will see how to check a number is divisible by 15 or not. In this case the number is very large number. So we put the number as string.To check whether a number is divisible by 15, if the number is divisible by 5, and divisible by 3. So to check divisibility by 5, we have to see the last number is 0 or 5. To check divisibility by 3, we will see the sum of digits are divisible by 3 or not.Example Live Demo#include using namespace std; bool isDiv15(string num){ int n = num.length(); if(num[n ... Read More
Let us first create a table −mysql> create table DemoTable( FirstName varchar(100) ); Query OK, 0 rows affected (0.97 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.31 sec) mysql> insert into DemoTable values('Adam'); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values('Sam'); Query OK, 1 row affected (0.37 sec) mysql> insert into DemoTable values('Mike'); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.27 ... Read More
For this, you can use a PREPARE statement. Let us first create a table −mysql> create table DemoTable( FirstName varchar(100), CountryName varchar(100) ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Adam', 'US'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Chris', 'AUS'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Robert', 'UK'); Query OK, 1 row affected (0.32 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+-----------+-------------+ | FirstName | ... Read More
Here we will see how to check given year is leap year or not, using PL/SQL. In PL/SQL code, some group of commands are arranged within a block of related declaration of statements.The leap year checking algorithm is like below.AlgorithmisLeapYear(year): begin if year is divisible by 4 and not divisible by 100, then it is leap year else if the number is divisible by 400, then it is leap year else it is not leap year endExampleDECLARE year NUMBER := 2012; BEGIN IF MOD(year, 4)=0 ... Read More
For this, use the GROUP BY HAVING clause. Let us first create a table −mysql> create table DemoTable( Name varchar(100), Age int ); Query OK, 0 rows affected (1.50 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 23); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('David', 21); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Chris', 23); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Chris', 21); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values('Mike', 25); Query OK, ... Read More
For this, you need to use IN() and after that FIELD() method. Let us first create a table −mysql> create table DemoTable( StudentId varchar(10), StudentName varchar(20) ) ; Query OK, 0 rows affected (4.11 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('10001', 'Adam'); Query OK, 1 row affected (0.52 sec) mysql> insert into DemoTable values('1010', 'Chris'); Query OK, 1 row affected (0.72 sec) mysql> insert into DemoTable values('1020', 'Bob'); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable values('1030', 'Carol'); Query OK, 1 row affected (0.47 sec) mysql> insert into ... Read More
Here we will see how to check a string is made up of alternating characters or not. If a string is like XYXYXY, it is valid, if a string is like ABCD, that is invalid.The approach is simple. We will check whether all ith character and i+2 th character are same or not. if they are not same, then return false, otherwise return true.Example Live Demo#include using namespace std; bool hasAlternateChars(string str){ for (int i = 0; i < str.length() - 2; i++) { if (str[i] != str[i + 2]) { return ... Read More
For exact string, you need to use wildcard ‘%’ with LIKE operator −select *from yourTableName where binary yourColumnName LIKE '%yourStringValue%';Let us first create a table −mysql> create table DemoTable( Name varchar(20) ); Query OK, 0 rows affected (1.93 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (1.11 sec) mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.38 sec) mysql> insert into DemoTable values('Adam'); Query OK, 1 row affected (1.19 sec) mysql> insert into DemoTable values('JOHN'); Query OK, 1 row affected (0.60 sec) mysql> insert into DemoTable ... Read More
Let us first create a table −mysql> create table DemoTable( Value int ); Query OK, 0 rows affected (1.35 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable values(NULL); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.59 sec) mysql> insert into DemoTable values(0); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.70 ... Read More