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Database Articles
Page 277 of 546
Select from table where value does not exist with MySQL?
For this, you can use NOT IN() −mysql> create table DemoTable1991 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(20) ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1991(StudentName) values('Chris'); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable1991(StudentName) values('Bob'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1991(StudentName) values('David'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable1991(StudentName) values('Sam'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1991(StudentName) values('Mike'); Query OK, 1 row affected (0.11 sec)Display all ...
Read MoreMySQL - Select dates that are one week ahead from today?
To get dates that are one week ahead from today, use DATEDIFF. Let us first get the current date −mysql> select curdate(); +------------+ | curdate() | +------------+ | 2019-12-20 | +------------+ 1 row in set (0.00 sec)We will first create a table −mysql> create table DemoTable1990 ( ShippingDate date ); Query OK, 0 rows affected (0.99 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1990 values('2019-12-13'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1990 values('2019-12-21'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1990 values('2019-12-20'); Query OK, 1 ...
Read MoreConvert VARCHAR data to MySQL date format?
To convert VARCHAR data to date format, you can use STR_TO_DATE() −mysql> create table DemoTable1989 ( DueDate varchar(20) ); Query OK, 0 rows affected (0.91 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1989 values('31/01/2015'); Query OK, 1 row affected (0.52 sec) mysql> insert into DemoTable1989 values('01/12/2018'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable1989 values('25/10/2019'); Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −mysql> select * from DemoTable1989;This will produce the following output −+------------+ | DueDate | +------------+ | 31/01/2015 | ...
Read MoreConvert DATE timestamp to return the month number
To return only the month number, you can use DATE_FORMAT() -mysql> create table DemoTable1999 ( ArrivalDate timestamp ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1999 values('2019-01-01 12:34:00'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1999 values('2019-12-31 10:04:00'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1999 values('2018-10-11 04:04:30'); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select * from DemoTable1999;This will produce the following output −+---------------------+ | ArrivalDate ...
Read MoreSet multiple values for custom columns in MySQL?
For this, you can use UNION ALL. Let us first create a table −mysql> create table DemoTable1987 ( UserValue int ); Query OK, 0 rows affected (2.90 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1987 values(4); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable1987 values(5); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1987 values(6); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1987 values(7); Query OK, 1 row affected (0.09 sec)Display all records from the table using select statement −mysql> select * from DemoTable1987;This ...
Read MoreOnly display specified values inside the IN clause with MySQL?
For this, you can use IN() along with ORDER BY clause. Let us first create a table −mysql> create table DemoTable1986 ( Number int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1986 values(50); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1986 values(60); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1986 values(100); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1986 values(200); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1986 values(350); Query OK, 1 row ...
Read MoreDate format to convert dates like Jan 2017, May 2018 to complete date in MySQL
For this, use STR_TO_DATE() along with DATE_FORMAT(). Let us first create a table −mysql> create table DemoTable1985 ( DueDate varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1985 values('Jan 2017'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1985 values('May 2018'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1985 values('Aug 2015'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1985;This will produce the following output −+----------+ | DueDate | ...
Read MoreHow to insert a row with a timestamp “X days ago” in MySQL?
To insert a row like this use the following syntax, wherein we are using CURRENT_TIMESTAMP −insert into yourTableName values(CURRENT_TIMESTAMP - INTERVAL ABS(RAND() * 100) DAY);To understand the above syntax, let us create a table −mysql> create table DemoTable1983 ( DueDate timestamp ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1983 values(CURRENT_TIMESTAMP - INTERVAL ABS(RAND() * 100) DAY); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1983 values(CURRENT_TIMESTAMP - INTERVAL ABS(RAND() * 100) DAY); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1983 ...
Read MoreMySQL - changing table engine from innoDB to MyISAM?
Let us first create a table −mysql> create table DemoTable1982 ( StudentId int , StudentName varchar(20), StudentAge int ); Query OK, 0 rows affected (0.00 sec)Let us check the table engine type -mysql> show create table DemoTable1982;This will produce the following output −+---------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table ...
Read MoreMySQL query to calculate sum from 5 tables with a similar column named “UP”?
For this, use UNION ALL along with SUM(). Let us create 5 tables −mysql> create table DemoTable1977 ( UP int ); Query OK, 0 rows affected (0.00 sec) mysql> insert into DemoTable1977 values(10); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1977 values(20); Query OK, 1 row affected (0.00 sec) mysql> select * from DemoTable1977; +------+ | UP | +------+ | 10 | | 20 | +------+ 2 rows in set (0.00 sec) mysql> create table DemoTable1978 ( UP int ); Query OK, 0 rows affected (0.00 sec) mysql> ...
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