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To encrypt and decrypt in MySQL, use the AES_ENCRYPT() and AES_DECRYPT() in MySQL −insert into yourTableName values(AES_ENCRYPT(yourValue, yourSecretKey)); select cast(AES_DECRYPT(yourColumnName, yourSecretKey) as char) from yourTableName;To understand the above syntax, let us first create a table −mysql> create table demo63 −> ( −> value blob −> ); Query OK, 0 rows affected (2.60 sec)Insert some records into the table with the help of insert command. We are encrypting while inserting −mysql> insert into demo63 values(AES_ENCRYPT('John', 'PASS')); Query OK, 1 row affected (0.18 sec) mysql> insert into demo63 values(AES_ENCRYPT('David', 'PASS')); Query OK, 1 row affected (0.41 sec) mysql> insert ... Read More
For this, use INSERT INTO SELECT statement in MySQL. Let us create a table −mysql> create table demo61 −> ( −> id int, −> name varchar(20) −> ) −> ; Query OK, 0 rows affected (1.84 sec)Insert some records into the table with the help of insert command −mysql> insert into demo61 values(1, 'John'); Query OK, 1 row affected (0.63 sec) mysql> insert into demo61 values(2, 'David'); Query OK, 1 row affected (0.13 sec) mysql> insert into demo61 values(1, 'Mike'); Query OK, 1 row affected (0.10 sec) mysql> insert into demo61 values(2, 'Carol'); Query OK, 1 row ... Read More
Following is the syntax −select yourColumnName1, yourColumnName2, yourColumnName3, . . . N from yourTableName where yourValue in(yourColumnName1, yourColumnName2) or yourColumnName1 is NULL;Let us create a table −mysql> create table demo60 −> ( −> id int not null auto_increment primary key, −> first_name varchar(20), −> last_name varchar(20) −> ) −> ; Query OK, 0 rows affected (2.11 sec)Insert some records into the table with the help of insert command −mysql> insert into demo60(first_name, last_name) values('John', 'Smith'); Query OK, 1 row affected (0.09 sec) mysql> insert into demo60(first_name, last_name) values('John', 'Doe'); Query OK, 1 row affected (0.51 sec) mysql> insert ... Read More
To store the exact real value, you need to use truncate() with 2 decimal point. Let us create a table −Following is the query to create a table.mysql> create table demo59 −> ( −> price decimal(19, 2) −> ); Query OK, 0 rows affected (1.12 sec)Insert some records into the table with the help of insert command −mysql> insert into demo59 values(truncate(15.346, 2)); Query OK, 1 row affected (0.14 sec) mysql> insert into demo59 values(truncate(20.379, 2)); Query OK, 1 row affected (0.72 sec) mysql> insert into demo59 values(truncate(25.555, 2)); Query OK, 1 row affected (0.16 sec) mysql> ... Read More
Fir this, use CASE WHEN statement in MySQL correctly. Let us see how.Let us create a table −mysql> create table demo58 −> ( −> id int not null auto_increment primary key, −> first_name varchar(20), −> last_name varchar(20) −> ); Query OK, 0 rows affected (2.15 sec)Insert some records into the table with the help of insert command −mysql> insert into demo58(first_name, last_name) values('John', 'Doe'); Query OK, 1 row affected (0.12 sec) mysql> insert into demo58(first_name, last_name) values('David', 'Smith'); Query OK, 1 row affected (0.29 sec) mysql> insert into demo58(first_name, last_name) values('John', 'Brown'); Query OK, 1 row affected (0.11 ... Read More
For this, you can use ORDER BY. Let us create a table −mysql> create table demo57 −> ( −> id int not null auto_increment primary key, −> full_name varchar(20) −> ); Query OK, 0 rows affected (1.60 sec)Insert some records into the table with the help of insert command −mysql> insert into demo57(full_name) values('John Smith'); Query OK, 1 row affected (0.24 sec) mysql> insert into demo57(full_name) values('David Miller'); Query OK, 1 row affected (0.13 sec) mysql> insert into demo57(full_name) values('Not Known'); Query OK, 1 row affected (0.13 sec) mysql> insert into demo57(full_name) values('Chris Brown'); Query OK, 1 ... Read More
Following is the syntax −insert into yourTableName values(yourValue1, yourValue2, .....N), (yourValue1, yourValue2, .....N), (yourValue1, yourValue2, .....N), (yourValue1, yourValue2, .....N), . . . NLet us create a table −mysql> create table demo56 −> ( −> id int, −> first_name varchar(20), −> last_name varchar(20), −> age int −> ); Query OK, 0 rows affected (1.91 sec)Insert some records into the table with the help of insert command −mysql> insert into demo56 values(1, 'John', 'Smith', 23), −> (2, 'David', 'Miller', 21), −> (3, 'Chris', 'Brown', 22), −> (4, 'Carol', 'Taylor', 20); Query OK, 4 rows affected (0.10 sec) Records: 4 Duplicates: 0 Warnings: ... Read More
Suppose we have a binary tree representing a game state of a two player game. Every internal node is filled with 0 and the leaves values represent the end score. Player 1 wants to maximize the end score while player 2 wants to minimize the end score. Player 1 will always make moves on nodes at even levels and player 2 will always make moves on odd levels. We have to fill in the binary tree with the resulting scores assuming both of players play optimally.So, if the input is likethen the output will beTo solve this, we will follow ... Read More
Suppose we have a list of numbers called nums and two values x and y, we have to find the maximum sum of two non-overlapping sublists in nums which have lengths x and y.So, if the input is like nums = [3, 2, 10, -2, 7, 6] x = 3 y = 1, then the output will be 22, as the sublist with length 3 we select [3, 2, 10] and for the other we select [7].To solve this, we will follow these steps −P := a list with single element 0for each x in A, doinsert (last element of ... Read More
Suppose we have a list of numbers called nums and another value k. We have to find the maximum sum of elements that we can delete, given that we must pop exactly k times, where each pop can be from the left or the right end.So, if the input is like nums = [2, 4, 5, 3, 1] k = 2, then the output will be 6, as we can delete 2 and the 4.To solve this, we will follow these steps −window := sum of all numbers from index 0 through k - 1ans := windowfor i in range ... Read More