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Articles on Trending Technologies
Technical articles with clear explanations and examples
Display records where first and last name begins with the same letter in MySQL
To check for the 1st letter of the first and last name, you need to use the LEFT().Let us first create a table −mysql> create table DemoTable789 ( FirstName varchar(100), LastName varchar(100) ); Query OK, 0 rows affected (0.78 sec)Insert some records in the table using insert command −mysql> insert into DemoTable789 values('Adam', 'Smith'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable789 values('Tom', 'Taylor'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable789 values('Bob', 'Brown'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable789 values('David', 'Miller'); Query ...
Read MoreSort data for duplicate record in MySQL
Use ORDER BY to sort data for duplicate record.Let us first create a table −mysql> create table DemoTable788 ( FirstName varchar(100), Score int ); Query OK, 0 rows affected (1.89 sec)Insert some records in the table using insert command −mysql> insert into DemoTable788 values('Chris', 78); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable788 values('Robert', 67); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable788 values('Chris', 98); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable788 values('Chris', 56); Query OK, 1 row affected (0.15 sec) mysql> insert into ...
Read MoreSelect a specific value between two column values in MySQL?
Let us first create a table −mysql> create table DemoTable787 ( Score1 int, Score2 int, Name varchar(100) ); Query OK, 0 rows affected (0.84 sec)Insert some records in the table using insert command −mysql> insert into DemoTable787 values(34, 56, 'Chris'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable787 values(73, 86, 'Robert'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable787 values(90, 99, 'David'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable787 values(80, 89, 'Adam'); Query OK, 1 row affected (0.21 sec)Display all records ...
Read MoreHow to display column values as CSV in MySQL?
To display column values as CSV, use GROUP_CONCAT().Let us first create a table −mysql> create table DemoTable786 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(100) ) AUTO_INCREMENT=101; Query OK, 0 rows affected (0.70 sec)Insert some records in the table using insert command −mysql> insert into DemoTable786(StudentName) values('Chris'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable786(StudentName) values('Robert'); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable786(StudentName) values('Mike'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable786(StudentName) values('Sam'); Query OK, 1 row affected (0.12 sec)Display all records from the table ...
Read MoreHow can I select rows which fall on a specific day of week in MySQL?
For specific day of week, use DAYOFWEEK().Let us first create a table −mysql> create table DemoTable785 ( CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY, CustomerName varchar(100), ShoppingDate date ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable785(CustomerName, ShoppingDate) values('Chris', '2019-07-03'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable785(CustomerName, ShoppingDate) values('Robert', '2019-07-01'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable785(CustomerName, ShoppingDate) values('David', '2019-07-06'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable785(CustomerName, ShoppingDate) ...
Read MoreMySQL query to sort column values and ignoring quotes on one of the values
To ignore quotes while ordering column values, use ORDER BY TRIM().Let us first create a table −mysql> create table DemoTable784 ( Message varchar(100) ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command −mysql> insert into DemoTable784 values('Good'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable784 values('"This is not a Message"'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable784 values('Bye'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable784 values('Hello'); Query OK, 1 row affected (0.15 sec)Display all records from the table using ...
Read MoreCount and sort rows with a single MySQL query
Let us first create a table −mysql> create table DemoTable783 ( FirstName varchar(100) ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable783 values('Adam'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable783 values('Chris'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable783 values('Chris'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable783 values('Adam'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable783 values('Adam'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable783 values('Robert'); Query OK, 1 ...
Read MoreMySQL query to group by column and display the sum of similar values in another column
For this, use GROUP BY HAVING clause.Let us first create a table −mysql> create table DemoTable782 ( Name varchar(100), Score int ); Query OK, 0 rows affected (1.18 sec)Insert some records in the table using insert command −mysql> insert into DemoTable782 values('John', 156); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable782 values('Carol', 250); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable782 values('Bob', 140); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable782 values('John', 126); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable782 values('John', ...
Read MoreFind the count of EMPTY or NULL columns in a MySQL table?
Let us first create a table −mysql> create table DemoTable781 ( Name varchar(100) ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable781 values(''); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable781 values('Chris'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable781 values(''); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable781 values(null); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable781 values(null); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable781 values(''); Query OK, 1 ...
Read MoreHow to display the column names from a table excluding some in MySQL?
To exclude some of the column names, use NOT IN.Let us first create a table −mysql> create table DemoTable780 ( CustomerId int, CustomerName varchar(100), CustomerAge int, CustomerCountryName varchar(100), isMarried tinyint(1) ); Query OK, 0 rows affected (0.47 sec)Here is the query to exclude result −mysql> select group_concat(column_name) from `information_schema`.`COLUMNS` m where table_schema = 'web' and table_name = 'DemoTable780' and column_name not in ('CustomerId','CustomerCountryName') group by table_schema,table_name;This will produce the following output -+------------------------------------+ | group_concat(column_name) | +------------------------------------+ | CustomerName,CustomerAge,isMarried | +------------------------------------+ 1 row in set (0.01 sec)
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