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Articles by Kumar Varma
Page 3 of 9
Can I get the count of repeated values in a column with MySQL?
Yes, you can use ORDER BY DESC with GROUP BY. Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> PostMessage varchar(100) -> ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(PostMessage) values('Hi'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(PostMessage) values('Hello'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(PostMessage) values('Hi'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(PostMessage) values('Awesome'); Query OK, ...
Read MoreHow to use if clause in MySQL to display Students result as Pass or Fail in a new column?
Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(100), -> Subject varchar(100), -> Score int -> ); Query OK, 0 rows affected (0.94 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name, Subject, Score) values('Chris', 'MySQL', 80); Query OK, 1 row affected (0.32 sec) mysql> insert into DemoTable(Name, Subject, Score) values('Robert', 'MongoDB', 45); Query OK, 1 row affected (0.62 sec) mysql> insert into DemoTable(Name, Subject, Score) values('Adam', 'Java', 78); Query OK, 1 row affected ...
Read MoreSelect the topmost record from a table ordered by desc on the basis of ID?
For this, use ORDER BY DESC with LIMIT 1. Let us first create table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(100), -> UserMessage text -> ); Query OK, 0 rows affected (1.17 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(UserName, UserMessage) values('Adam', 'Hi'); Query OK, 1 row affected (0.92 sec) mysql> insert into DemoTable(UserName, UserMessage) values('Chris', 'Awesome'); Query OK, 1 row affected (0.52 sec) mysql> insert into DemoTable(UserName, UserMessage) values('Robert', 'Nice'); Query OK, 1 row affected (0.65 sec) ...
Read MoreCan we compare numbers in a MySQL varchar field?
Yes, we can do this by first using CAST(). Let us first create a table −mysql> create table DemoTable -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentScore varchar(100) -> ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(StudentScore) values('90'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable(StudentScore) values('100'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(StudentScore) values('56'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(StudentScore) values('98'); Query OK, 1 ...
Read MoreMySQL query to remove a value with only numbers in a column
For this, you can use REGEXP. Let us first create a table −mysql> create table DemoTable -> ( -> ClientCode varchar(100) -> ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris902'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values('Robert_'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('903'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('123_David'); Query OK, 1 row affected (0.21 sec)Display all records from the table using select statement ...
Read MoreHow to convert string to time in MySQL?
You can use format specifier. Following is the syntax −select str_to_date(yourColumnName, '%d/%m/%Y %h:%i %p') as anyAliasName from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> DueDate varchar(100) -> ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('11/02/2019 10:35'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('21/12/2018 12:01'); Query OK, 1 row affected (0.19 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+------------------+ | DueDate ...
Read MoreMySQL query to get the character length for all the values in a column?
To get the character length, use the CHAR_LENGTH() method. Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(100) -> ); Query OK, 0 rows affected (1.04 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Robert'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Bob'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.15 sec)Display all records from the table ...
Read MoreCreate a temporary table in a MySQL procedure?
To create a temporary table in a MySQL procedure, following is the syntax −CREATE PROCEDURE yourProcedureName() BEGIN CREATE TEMPORARY TABLE yourTemporaryTableName SELECT yourValue; ENDLet us implement the above syntax to create a temporary table and insert some records in the table. Following is the query to create a stored procedure and a temporary table in it −mysql> DELIMITER // mysql> CREATE PROCEDURE create_Temporary_Table() -> BEGIN -> CREATE TEMPORARY TABLE tmpDemoTable SELECT 500; -> END// Query OK, 0 rows affected (0.15 sec)Following is the query to insert record in the table −mysql> ...
Read MoreMySQL query to display structure of a table
To display structure of a table, following is the syntax −show create table yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> EmployeeFirstName varchar(100), -> EmployeeLastName varchar(100), -> EmployeeAge int, -> isMarried tinyint(1), -> EmployeeAddress varchar(100), -> EmployeeCountryName varchar(100) -> ); Query OK, 0 rows affected (0.62 sec)Here is the query to display structure −mysql> show create table DemoTable;OutputThis will produce the following output −+--------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table ...
Read MoreMultiple column sorting in MySQL?
Let us first create a table −mysql> create table DemoTable -> ( -> Id int, -> Value int -> ); Query OK, 0 rows affected (0.68 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 85885); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(101, 885995474); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(100, 895943); 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 −+------+-----------+ | Id ...
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