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Database Articles
Page 378 of 546
Format MySQL date and convert to year-month-day
Let us first create a table −mysql> create table DemoTable666(AdmissionDate varchar(200)); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable666 values('Sat, 20 Jul 2019 04:29:35'); Query OK, 1 row affected (1.12 sec) mysql> insert into DemoTable666 values('Fri, 02 Oct 2018 12:19:15'); Query OK, 1 row affected (1.05 sec) mysql> insert into DemoTable666 values('Sun, 01 Aug 2016 11:10:05'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable666 values('Fri, 06 Nov 2015 04:06:05 -0500'); Query OK, 1 row affected (0.24 sec)Display all records from the table using select statement −mysql> ...
Read MoreCreate a table in MySQL and implement TIMESTAMPDIFF()?
The TIMESTAMPDIFF() calculates the difference between two dates or datetime expressions. Let us first create a table −mysql> create table DemoTable665( PunchInTime datetime, PunchOutTime datetime, Details INT(11) AS (ABS(TIMESTAMPDIFF(second, PunchInTime, PunchOutTime))) )ENGINE=MyISAM; Query OK, 0 rows affected (0.23 sec)Insert some records in the table using insert command −mysql> insert into DemoTable665(PunchInTime, PunchOutTime) values('2019-09-21 9:30:10', '2019-09-21 04:34:56'); Query OK, 1 row affected (0.05 sec) mysql> insert into DemoTable665(PunchInTime, PunchOutTime) values('2019-11-11 10:00:20', '2019-11-11 05:30:16'); Query OK, 1 row affected (0.04 sec)Display all records from the table using select statement −mysql> select *from DemoTable665;This will produce the following output −+---------------------+---------------------+---------+ ...
Read MoreFor timestamp, which datatype is used in MySQL?
The TIMESTAMP data type is used for values containing both date and time parts. Let us first create a table −mysql> create table DemoTable662( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserName varchar(100), UserPostDate datetime ); Query OK, 0 rows affected (0.50 sec)Following is the query for valid default timestamp values −mysql> alter table DemoTable662 MODIFY COLUMN UserPostDate TIMESTAMP NOT NULL DEFAULT current_timestamp; Query OK, 0 rows affected (1.81 sec) Records: 0 Duplicates: 0 Warnings: 0Let us check the description of table once again −mysql> desc DemoTable662;This will produce the following output −+--------------+--------------+------+-----+-------------------+----------------+ | Field | ...
Read MoreMySQL to Implementing OR operator in a WHERE clause?
The OR operator gives true result when any one operand is true. Let us now see an example and create a table −mysql> create table DemoTable663(ClientId int, ClientName varchar(100), ClientAge int); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command −mysql> insert into DemoTable663 values(100, 'Chris', 45); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable663 values(101, 'Robert', 29); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable663 values(102, 'John', 45); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable663 values(103, 'Chris', 35); Query OK, 1 row affected ...
Read MoreDisplay only the default values set for columns in MySQL
Let us first create a table and set default values −mysql> create table DemoTable803(UserId int DEFAULT 101, UserName varchar(100) DEFAULT 'Chris'); Query OK, 0 rows affected (1.18 sec)Insert some records in the table using insert command. For the values we are not inserting, the default values will get set automatically −mysql> insert into DemoTable803 values(102, 'Chris'); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable803(UserName) values('Mike'); Query OK, 1 row affected (0.48 sec) mysql> insert into DemoTable803(UserId) values(103); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable803 values(); Query OK, 1 row affected (0.22 sec) mysql> ...
Read MoreHow to extract from datetime column in MySQL by comparing only date and ignoring whitespace?
To extract from datetime column, you can use date() along with trim(). Here, trim() is used to remove whitespace while comparing. Let us first create a table −mysql> create table DemoTable661(Duedate datetime); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable661 values(' 2019-01-21 12:02:21'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable661 values(' 2019-07-11 11:55:59 '); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable661 values('2019-11-21 04:00:59 '); Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement −mysql> select ...
Read MoreIs there a way to subtract number of days from a date in MySQL?
Yes, you can use date_sub() to subtract number of days from a date. Following is the syntax −select date_sub(yourColumnName, Interval yourAmountOfDays day) from yourTableName;Let us first create a table −mysql> create table DemoTable660(AdmissionDate datetime); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert command −mysql> insert into DemoTable660 values('2018-01-24'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable660 values('2019-07-10'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable660 values('2020-11-20'); Query OK, 1 row affected (0.59 sec)Display all records from the table using select statement −mysql> select *from DemoTable660;This will produce the ...
Read MoreHow to fetch a specific row when values are the same in MySQL?
To fetch a specific row when values are the same, use GROUP BY. Let us first create a table −mysql> create table DemoTable659(Id int, Name varchar(100), Score int); Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert command −mysql> insert into DemoTable659 values(11, 'John', 45); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable659 values(15, 'John', 59); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable659 values(15, 'Sam', 61); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select *from DemoTable659;This will produce the ...
Read MoreHow to convert a MySQL TIME value to days and hours form?
Here, we are converting time value, for example 150:50:10 to days and hours form, i.e. 6 days 6 hours.You can use CONCAT() along with HOUR() for this. Let us first create a table −mysql> create table DemoTable657(DueTime time); Query OK, 0 rows affected (3.68 sec)Insert some records in the table using insert command. Here, we have inserted the records in the form of total hours −mysql> insert into DemoTable657 values('120:30:00'); Query OK, 1 row affected (0.38 sec) mysql> insert into DemoTable657 values('150:50:10'); Query OK, 1 row affected (0.27 sec)Display all records from the table using select statement −mysql> select *from ...
Read MoreMySQL Stored procedure won't fetch the whole table?
You can use SELECT *FROM yourTableName in stored procedure. Let us first create a table −mysql> create table DemoTable654 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentFirstName varchar(100) ); Query OK, 0 rows affected (0.70 sec)Insert some records in the table using insert command −mysql> insert into DemoTable654(StudentFirstName) values('John'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable654(StudentFirstName) values('Sam'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable654(StudentFirstName) values('Mike'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable654(StudentFirstName) values('Robert'); Query OK, 1 row affected (0.12 sec)Display all records from the table using ...
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