Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
MySQL Articles
Page 302 of 355
Does MySQL converts bool to tinyint(1) internally?
Yes, MySQL internally convert bool to tinyint(1) because tinyint is the smallest integer data type.You can also say the bool is synonym for tinyint(1). Let us first create a sample table:mysql> create table boolToTinyIntDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20), -> isAgeGreaterThan18 bool -> ); Query OK, 0 rows affected (1.02 sec)Let us now check the description of table:mysql> desc boolToTinyIntDemo;This will produce the following output+--------------------+-------------+------+-----+---------+----------------+ | Field ...
Read MoreHow to use "OR" condition in MySQL CASE expression?
Set the same condition like “OR” in a MySQL CASE expression. Let us first create a sample table.Following is the querymysql> create table caseOrConditionDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(100), -> Score int -> ); Query OK, 0 rows affected (0.49 sec)Following is the query to insert some records in the table using insert command:mysql> insert into caseOrConditionDemo(Name, Score) values('Larry', 85); Query OK, 1 row affected (0.18 sec) mysql> insert into caseOrConditionDemo(Name, Score) values('Sam', 74); Query OK, 1 row affected (0.20 sec) mysql> insert into caseOrConditionDemo(Name, ...
Read MoreDeleting the nth row in MySQL?
To delete nth row in MySQL, use DELETE statement and work with subquery. Let us first create a table:mysql> create table DemoTable1 -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(100) -> ); Query OK, 0 rows affected (0.99 sec)Following is the query to insert some records in the table using insert command:mysql> insert into DemoTable1(StudentName) values('Larry'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1(StudentName) values('Sam'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1(StudentName) values('Mike'); Query OK, 1 row affected (0.18 sec) mysql> ...
Read MoreHow to work with array variable in MySQL?
MySQL does not support array variables. To get the same result, use the table DUAL. Following is the syntax:SELECT yourValue1 AS ArrayValue FROM DUAL UNION ALL SELECT yourValue2 FROM DUAL UNION ALL SELECT yourValue3 FROM DUAL UNION ALL SELECT yourValue4 FROM DUAL UNION ALL . . . . . . SELECT yourValueN FROM DUAL;Let us create a sample table:mysql> SELECT 1 AS ArrayValue FROM DUAL UNION ALL SELECT 2 FROM DUAL UNION ALL SELECT 3 FROM DUAL UNION ALL SELECT 4 FROM ...
Read MoreHow to call a stored procedure using select statement in MySQL?
In MySQL, it is not possible to use select from procedure in FROM clause. You can use CALL command and after that the SELECT statement can be executed.Let us first create a table:mysql> create table DemoTable2 -> ( -> CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> CustomerName varchar(100), -> ShippingDateTime datetime -> ); Query OK, 0 rows affected (0.66 sec)Following is the query to create stored procedure:mysql> DELIMITER // mysql> CREATE PROCEDURE insert_information(Name varchar(100), shippingtime datetime) -> BEGIN -> -> INSERT INTO DemoTable2(CustomerName, ShippingDateTime) VALUES(Name, shippingtime); -> END -> ...
Read MoreMySQL query to retrieve records from the part of a comma-separated list?
To retrieve records from the part of a comma-separated list, you can use built in function FIND_IN_SET().Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20), Marks varchar(200) ); Query OK, 0 rows affected (0.61 sec)Following is the query to insert some records in the table using insert command −mysql> insert into DemoTable(Name, Marks) values('Larry', '98, 34, 56, 89'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(Name, Marks) values('Chris', '67, 87, 92, 99'); Query OK, 1 row affected (0.15 sec) mysql> insert ...
Read MoreHow to copy data from one field to another on every row in MySQL?
To copy data from one field to another on every row, use the UPDATE command.Let us first create a table −mysql> create table DemoTable ( StudentId int, StudentFirstName varchar(20), StudentMarks int default 0 ); Query OK, 0 rows affected (0.49 sec)Following is the query to insert records in the table using insert command −mysql> insert into DemoTable(StudentId, StudentFirstName) values(89, 'Larry'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(StudentId, StudentFirstName) values(35, 'Robert'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(StudentId, StudentFirstName) values(48, 'Chris'); Query OK, 1 row affected (0.13 sec) ...
Read MoreDisplay IDs in a particular order with MySQL IN()?
To display IDs in a particular order i.e. the order of your choice use FIELD() method.Let us first create a table −mysql> create table DemoTable ( UserId int ); Query OK, 0 rows affected (0.64 sec)Following is the query to insert some records in the table using insert command −mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(80); Query OK, 1 row affected (0.13 sec) ...
Read MoreAdd a temporary column in MySQL where the values depend on another column?
You can use CASE statement for this and set conditions to get result in the temporary column.Let us first create a table −mysql> create table DemoTable ( EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, EmployeeName varchar(20), EmployeeSalary int, EmployeeExperience int ); Query OK, 0 rows affected (0.64 sec)Following is the query to insert some records in the table using insert command −mysql> insert into DemoTable(EmployeeName, EmployeeSalary, EmployeeExperience) values('Larry', 4500, 5); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(EmployeeName, EmployeeSalary, EmployeeExperience) values('Mike', 130000, 8); Query OK, 1 row affected (0.21 sec) mysql> ...
Read MoreHow to convert all the records in a MySQL table from uppercase to lowercase?
Convert all the records in a MySQL table from uppercase to lowercase using UPDATE command along with LOWER() method.Let us first create a table −mysql> create table DemoTable ( Id varchar(100), StudentFirstName varchar(20), StudentLastName varchar(20), StudentCountryName varchar(10) ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('STU-101', 'John', 'Smith', 'US'); Query OK, 1 row affected (0.59 sec) mysql> insert into DemoTable values('STU-102', 'John', 'Doe', 'UK'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('STU-103', 'David', 'Miller', 'AUS'); Query OK, 1 ...
Read More