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MySQL Articles
Page 180 of 355
MySQL query to find the top two highest scores
For this, use aggregate function MAX(). Let us first create a table −mysql> create table DemoTable1383 -> ( -> Id int, -> PlayerScore int -> ); Query OK, 0 rows affected (0.90 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1383 values(200, 78); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1383 values(200, 89); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1383 values(200, 89); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1383 values(200, 87); Query OK, 1 row affected (0.29 sec) mysql> insert into ...
Read MoreHow to update a MySQL table by swapping two column values?
To swap two values in a column, use CASE WHEN statement. Let us first create a table −mysql> create table DemoTable1382 -> ( -> StudentName varchar(20) -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1382 values('John'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1382 values('Chris'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1382 values('Adam'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1382 values('Bob'); Query OK, 1 row affected (0.17 sec)Display all records from the table using ...
Read MoreHow to get the maximum value from a column with alphanumeric strings beginning with specific characters in MYSQL?
For maximum value, use MAX() along with CAST() for conversion. Since we want maximum value from string-numbers beginning with specific characters, use RLIKE. Let us first create a table −mysql> create table DemoTable1381 -> ( -> DepartmentId varchar(40) -> ); Query OK, 0 rows affected (0.48 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1381 values('IT794'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1381 values('AT1034'); Query OK, 1 row affected (0.52 sec) mysql> insert into DemoTable1381 values('IT967'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1381 values('IT874'); Query ...
Read MoreMySQL UNION SELECT and IN clause in a single query
Let us first create a table −mysql> create table DemoTable1 -> ( -> StudentId int, -> StudentName varchar(20) -> ); Query OK, 0 rows affected (1.24 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(210, 'Adam'); Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −mysql> select * from DemoTable1;This will produce the following output −+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 210 | Adam | +-----------+-------------+ 1 row in set (0.00 sec)Here is the query to create ...
Read MoreHow can I view cascades in MySQL?
To view cascades, use SHOW CREATE TABLE in MySQL. Let us first create a table −mysql> create table DemoTable1378 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> EmployeeId varchar(20), -> EmployeeFirstName varchar(20), -> EmployeeLastName varchar(20), -> EmployeeCountryName varchar(40), -> EmployeeAge int, -> EmployeeSalary int, -> UNIQUE(EmployeeFirstName, EmployeeSalary), -> INDEX First_Last_NameIndex(EmployeeFirstName, EmployeeLastName) -> ); Query OK, 0 rows affected (0.93 sec)Let us now view cascades in MySQL −mysql> show create table DemoTable1378;This will produce the following output −+---------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table ...
Read MoreHow to add a year and two days to a date with a single MySQL query?
For this, use INTERVAL in MySQL. Let us first create a table −mysql> create table DemoTable1376 -> ( -> AdmissionDate date -> ); Query OK, 0 rows affected (0.68 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1376 values('2018-01-21'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1376 values('2017-12-01'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1376 values('2018-11-02'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1376 values('2019-03-14'); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement−mysql> select * from ...
Read MoreHow to use count with CASE condition in a MySQL query?
Use CASE WHEN for this in MySQL and set CASE condition inside the COUNT() method to count. Let us first create a table −mysql> create table DemoTable1374 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20), -> Score int -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1374(Name, Score) values('Chris', 45); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1374(Name, Score) values('David', 78); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1374(Name, Score) values('Bob', 45); ...
Read MoreUpdate a MySQL column with JSON format?
To display records like JSON format, use MySQL concat(). Let us first create a table −mysql> create table DemoTable1373 -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentDetails text -> ); Query OK, 0 rows affected (0.86 sec)Insert some records in the table using insert command. Here, we haven’t inserted anything −mysql> insert into DemoTable1373 values(); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable1373 values(); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable1373 values(); Query OK, 1 row affected (0.18 sec)Display all records from the table using ...
Read MoreSubtracting a number from a single MySQL column value?
For this, just update the table and subtract. Let us first create a table −mysql> create table DemoTable1372 -> ( -> Value int -> ); Query OK, 0 rows affected (0.77 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1372 values(500); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1372 values(100); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable1372 values(900); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1372 values(1000); Query OK, 1 row affected (0.32 sec)Display all records from the table using select statement −mysql> ...
Read MoreGet the sum only from specific cells in MySQL?
For only specific cells, set a condition with WHERE and use aggregate function SUM() to add. Let us first create a table −mysql> create table DemoTable1370 -> ( -> StudentName varchar(20), -> Marks int -> ); Query OK, 0 rows affected (0.87 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1370 values('Adam Smith', 56); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1370 values('Chris Brown', 67); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1370 values('Adam Smith', 69); Query OK, 1 row affected (0.20 sec) mysql> insert into ...
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