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Database Articles
Page 337 of 547
Selecting records 15 days before today in MySQL?
For this, you can use the concept of INTERVAL and DATE_SUB(). Let us first create a table −mysql> create table DemoTable1845 ( ArrivalDate date ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1845 values('2019-12-02'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1845 values('2019-11-18'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1845 values('2019-12-18'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1845 values('2019-12-25'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1845 values('2019-11-15'); Query ...
Read MoreCalculating percentage in a MySQL query and round off the result
For this, you can use CONCAT() and round(). Let us first create a table −mysql> create table DemoTable1844 ( Number int, TotalNumber int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1844 values(50, 500); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1844 values(80, 500); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1844 values(98, 500); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1844 values(45, 500); Query OK, 1 row affected (0.00 sec)Display all ...
Read MoreGet beginning and end date from a specific year in MySQL
For this, use MySQL YEAR() function. Let us first create a table −mysql> create table DemoTable1843 ( StartDate date, EndDate date ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1843 values('2019-01-21', '2019-10-12'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1843 values('2018-10-12', '2018-12-31'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1843 values('2016-04-01', '2017-05-02'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1843;This will produce the ...
Read MoreMultiplying column with NULL row in MySQL?
To multiply with NULL row, you can use COALESCE(). Let us first create a table −mysql> create table DemoTable1842 ( NumberOfItems int, Amount int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1842 values(10, 40); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1842 values(20, 5); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1842 values(NULL, 10); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1842;This ...
Read MoreReturn records that do not have a value in a certain field with two SELECT statement in a single MySQL query
For this, you can use WHERE clause along with subquery. Let us first create a table −mysql> create table DemoTable1840 ( UserName varchar(20), UserType ENUM('GUEST', 'ADMIN') ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1840 values('Chris', 'Admin'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1840 values('David', 'Guest'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1840 values('Chris', 'Guest'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * ...
Read MoreWhat is the fastest way to insert a large number of rows into a MySQL table?
The syntax for the fastest way is given below. Here, we have used INSERT INTO just once and formed an optimized way −insert into yourTableName values(NULL, yourValue1', yourValue2), (NULL, yourValue1', yourValue2), ....N;Let us first create a table −mysql> create table DemoTable1839 ( ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientName varchar(20), ClientAge int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1839 values(NULL, 'Chris', 29), (NULL, 'Chris', 29), (NULL, 'Chris', 29), (NULL, 'Chris', 29), (NULL, 'Chris', 29), (NULL, 'Chris', ...
Read MoreSort search results based on substring position in MySQL
To sort search results based on substring position, use ORDER BY LOCATE(). Let us first create a table −mysql> create table DemoTable1838 ( Subject varchar(100) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1838 values('MongoDB MySQL'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1838 values('MySQL Java'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1838 values('JavaWithMySQL'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1838; This will ...
Read MoreHow to get a specific column record from SELECT query in MySQL?
Let us first create a table −mysql> create table DemoTable1837 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1837(StudentName) values('Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1837(StudentName) values('David'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1837(StudentName) values('Bob'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1837(StudentName) values('Mike'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement ...
Read MoreFix MySQL Error #1064 - You have an error in your SQL syntax... near 'TYPE=MyISAM?
This error occurs when we use TYPE for ENGINE NAME. The error is as follows −mysql> create table DemoTable1836 ( ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientName varchar(20) )Type=MyISAM AUTO_INCREMENT=1; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Type=MyISAM AUTO_INCREMENT=1' at line 5Now, in MySQL 8, you can use ENGINE instead of Type. Let us first create a table −mysql> create table DemoTable1836 ( ClientId int NOT ...
Read MoreHow to fetch random rows in MySQL with comma separated values?
To fetch random rows in MySQL, use ORDER BY RAND(). Let us first create a table −mysql> create table DemoTable1835 ( ListOfIds varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1835 values('10, 20, 30'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1835 values('70, 80, 90'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1835 values('45, 67, 89'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1835 values('98, 96, 49'); Query OK, 1 row affected (0.00 ...
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