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Database Articles
Page 387 of 547
MySQL query to sort increasing the difference between n and the value in the table?
For sort by distance, use ORDER BY ABS(). Let us first create a table −mysql> create table DemoTable ( Number int ); Query OK, 0 rows affected (1.16 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.51 sec) mysql> insert into DemoTable values(101); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(102); Query OK, 1 row affected (0.46 sec) mysql> insert into DemoTable values(103); Query OK, 1 row affected (0.84 sec) mysql> insert into DemoTable values(104); Query OK, 1 row affected (0.17 sec) mysql> insert ...
Read MoreFetch date record that equals today in MySQL
For this, compare the date records with the current date using the CURDATE() method. Let us first create a table −mysql> create table DemoTable ( RegistrationLastDate datetime ); Query OK, 0 rows affected (0.61 sec)Let’s say the current date is −2019-09-03Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-08-01'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('2019-09-03 9:50:56'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('2019-09-03'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('2019-09-02'); Query OK, 1 row affected (0.18 sec) mysql> ...
Read MoreMySQL ORDER BY CASE to display special character in the beginning
Let us first create a table −mysql> create table DemoTable ( StudentId varchar(40) ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('10'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('~'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(NULL); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('40'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(NULL); Query OK, 1 row affected ...
Read MoreHow to create NVARCHAR column in MySQL?
The MySQL converts NVARCHAR() to VARCHAR(). NVARCHAR stands for National Varchar in MySQL. Let us first create a table with one of the columns “StudentName” as NVARCHAR −mysql> create table DemoTable ( StudentName NVARCHAR(40), StudentCountryName VARCHAR(50) ); Query OK, 0 rows affected, 1 warning (0.49 sec)Let us check the description of the table −mysql> desc DemoTable;This will produce the following output. As you can see below, the StudentName column with NVARCHAR type is automatically converted to VARCHAR in MySQL −+--------------------+-------------+------+-----+---------+-------+ | Field | Type ...
Read MoreMySQL query to update all the values in a column with numeric incremental values like John1, John2, John3, etc.
To update all the values in a column to John1, John2, etc.; you need to set incremental values 1, 2, 3, etc. and concatenate them to the records. Let us first create a table −mysql> create table DemoTable ( StudentId varchar(80) ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command. Here, for our example, we have set similar names −mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values('John'); Query OK, 1 row ...
Read MoreHow to delete records based on a word with underscore like MONTH_JAN'?
For this, you can use LIKE operator. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(40), BornMonth varchar(40) ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name, BornMonth) values('Chris', 'MONTH_DEC'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(Name, BornMonth) values('Bob', 'MONTH_JAN'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(Name, BornMonth) values('Mike', 'MONTH_FEB'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Name, BornMonth) values('David', 'MONTH_JAN'); Query OK, 1 ...
Read MoreMySQL edit and update records including employee salary
The UPDATE command is used in MySQL to update records. With it, the SET command is used to set new values. Let us first create a table −mysql> create table DemoTable ( EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, EmployeeName varchar(50), EmployeeSalary int ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(EmployeeName, EmployeeSalary) values('Chris', 56780); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(EmployeeName, EmployeeSalary) values('Robert', 45670); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(EmployeeName, EmployeeSalary) values('Mike', 87654); Query OK, 1 ...
Read MoreDoes using SERIAL as column name already includes 'NOT NULL' in MySQL?
In MySQL, SERIAL is an alias for BIGINT UNSIGNED NOT NULL AUTO_INCREMENT UNIQUE. So, do not use NOT NULL after SERIAL, since it already includes NOT NULL as part of its definition.Let us see an example and create a table. Here, we have a column with the name “serial” −mysql> create table DemoTable ( Id serial ); Query OK, 0 rows affected (0.42 sec)Insert some records in the table using insert command. We aren’t including any value while inserting −mysql> insert into DemoTable values(); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values(); Query OK, 1 ...
Read MoreHow to delete rows older than 14 days in MySQL?
To delete, use MySQL DELETE. However, to get records older than 14 days, subtract the current date with date interval of 14 days. The syntax for the same is shown below −delete from yourTableName where yourColumnName< (curdate() - interval 14 day);Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, DueDate date ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(DueDate) values('2019-08-20'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(DueDate) values('2019-08-19'); Query OK, 1 row affected ...
Read MoreCreate a table inside a MySQL stored procedure and insert a record on calling the procedure
Create a table inside the stored procedure and use INSERT as well −mysql> DELIMITER // mysql> CREATE PROCEDURE create_TableDemo(id int,name varchar(100),age int) BEGIN CREATE TABLE DemoTable ( ClientId int NOT NULL, ClientName varchar(30), ClientAge int, PRIMARY KEY(ClientId) ); INSERT INTO DemoTable VALUES(id,name,age); SELECT *FROM DemoTable; END // Query OK, 0 rows affected (0.17 sec) mysql> DELIMITER ;Call the stored procedure using CALL command −mysql> CALL create_TableDemo(100,'Robert',28);This will produce the following output −+----------+------------+-----------+ | ClientId | ClientName | ClientAge | +----------+------------+-----------+ | 100 | Robert | 28 | +----------+------------+-----------+ 1 row in set (0.76 sec) Query OK, 0 rows affected (0.78 sec)
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