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MySQL Articles
Page 153 of 355
What would happen if we insert empty values in a table with a column set as type TIMESTAMP CURRENT_TIMESTAMP?
If we will insert nothing in the INSERT statement, then for timestamp type, it would insert the current date-time. Let us first create a table −mysql> create table DemoTable -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserLoginDate timestamp default current_timestamp -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(); Query OK, 1 row affected (0.08 ...
Read MoreSort items in MySQL with dots?
Let us first create a table −mysql> create table DemoTable -> ( -> Value varchar(20) -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('20'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('10.5'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('11'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('10'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('20.5'); Query OK, 1 row affected (0.13 sec)Display all records from the table ...
Read MoreThe easiest way to insert date records in MySQL?
Use the STR_TO_DATE() method to insert date records as in the below syntax −select str_to_date(yourColumnName, '%b %Y') from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> JoiningYear varchar(20) -> ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Jan 2018'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('May 2107'); Query OK, 1 row affected (0.32 sec) mysql> insert into DemoTable values('Aug 2019'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Oct 2020'); Query OK, ...
Read MoreImplement MySQL REGEXP to fetch records with . and numbers
Let us first create a table −mysql> create table DemoTable -> ( -> Version varchar(20) -> ); Query OK, 0 rows affected (0.77 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('1.0.0'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values('2.s6.9'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('1.5.0'); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+---------+ | Version | +---------+ | 1.0.0 | | 2.s6.9 | ...
Read MoreMySQL query to display only 15 words from the left?
For this, use LEFT in MySQL. Let us first create a table −mysql> create table DemoTable -> ( -> Title text -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Java database connectivity to MySQL database'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Python with django framework'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('C with data structure and algorithm'); Query OK, 1 row affected (0.33 sec)Display all records from the table using select statement −mysql> select ...
Read MoreReplacing numbers on a comma delimited result with MySQL?
For this, use CASE statement along with FIND_IN_SET(). Let us first create a table −mysql> create table DemoTable1629 -> ( -> Month varchar(100) -> ); Query OK, 0 rows affected (0.64 sec)Insert some records in the table using insert command.mysql> insert into DemoTable1629 values('2, 4, 6'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1629 values('1, 3, 5, 12'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1629 values('7, 8, 9, 10'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement − mysql> select ...
Read MoreCreate MySQL datetime column with default 0000-00-00?
To set default, you can use the DEFAULT keyword in MySQL. Let us first create a table −mysql> create table DemoTable -> ( -> EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> EmployeeName varchar(20), -> EmployeeJoiningDate datetime default '0000-00-00 00:00:00' -> )ENGINE=MyISAM, AUTO_INCREMENT=100; Query OK, 0 rows affected (0.21 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(EmployeeName) values('Chris'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(EmployeeName) values('David'); Query OK, 1 row affected (0.04 sec) mysql> insert into DemoTable(EmployeeName) values('Mike'); Query OK, 1 row affected (0.03 sec) mysql> ...
Read MoreMySQL query to get a single value from position of comma-separated string?
For this, use SUBSTRING_INDEX(). Let us first create a table −mysql> create table DemoTable1615 -> ( -> ListOfSubject text -> ); Query OK, 0 rows affected (0.81 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1615 values('Python, Java, MySQL, MongoDB, C, C++, ASP.net'); Query OK, 1 row affected (0.19 sec)Display all records from the table using select statement −mysql> select * from DemoTable1615; This will produce the following output −+-----------------------------------------+ | ListOfSubject | +-----------------------------------------+ | Python, Java, MySQL, MongoDB, C, ...
Read MoreGet three records having higher value from MySQL
Let us first create a table −mysql> create table DemoTable1614 -> ( -> StudentName varchar(20), -> StudentScore int -> ); Query OK, 0 rows affected (0.78 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1614 values('Adam', 65); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1614 values('Chris', 89); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1614 values('Bob', 58); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable1614 values('Sam', 98); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1614 values('Mike', 87); Query OK, 1 ...
Read MoreIs there a function similar to Oracle's trunc (sysdate) in MySQL?
Yes, you can use DATE() to get only date part in MySQL and you can use CURDATE() to get the current date in MySQL.The current date is as follows −mysql> select curdate(); +------------+ | curdate() | +------------+ | 2019-10-20 | +------------+ 1 row in set (0.00 sec)Let us first create a table −mysql> create table DemoTable1613 -> ( -> PostingDate datetime -> ); Query OK, 0 rows affected (0.48 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1613 values('2019-10-20 12:02:45'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1613 values('2018-10-20 12:02:45'); ...
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