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MySQLi Articles
Page 247 of 341
Add two weeks to a date in MySQL?
To add two weeks to a date in MySQL, use DATE_ADD() −insert into yourTableName(yourColumnName) values(date_add(now(), interval 2 week));Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, ShippingDate datetime ); Query OK, 0 rows affected (0.62 sec)Following is the query to get the current date −mysql> select now(); +-----------------------+ | now() | +-----------------------+ | 2019-06-02 10 :36 :49 | +-----------------------+ 1 row in set (0.00 sec)Insert some records in the table using ...
Read MoreGet the count of the most frequently occurring values in MySQL?
For this, use the aggregate function COUNT() along with GROUP BY. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Value int ); Query OK, 0 rows affected (0.74 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Value) values(976); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(Value) values(67); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(Value) values(67); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Value) values(1); Query OK, 1 row affected (0.27 sec) mysql> ...
Read MoreHow to select a row where one of several columns equals a certain value in MySQL?
For this, you can use multiple OR. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(10), LastName varchar(10), Age int, CountryName varchar(10) ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName, LastName, Age, CountryName) values('John', 'Smith', 21, 'US'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(FirstName, LastName, Age, CountryName) values('Carol', 'Taylor', 22, 'AUS'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(FirstName, LastName, Age, CountryName) values('David', ...
Read MoreRetrieve from MySQL only if it contains two hyphen symbols?
For this, use the LIKE operator. Let us first create a table:mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Password varchar(100) ); Query OK, 0 rows affected (1.27 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Password) values('John@--123'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(Password) values('---Carol234'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(Password) values('--David987'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(Password) values('Mike----53443'); Query OK, 1 row affected (0.30 sec)Display all records from the table using select ...
Read MoreCan we use {} while creating a MySQL table?
No, you need to use open and close parenthesis like this ( ) while creating a table. Use the below syntax −CREATE TABLE IF NOT EXISTS yourTableName ( yourColumnName1 dataType1, . . . . . N );Let us first create a table −mysql> CREATE TABLE IF NOT EXISTS DemoTable ( CustomerId int, CustomerName varchar(20), CustomerAge int , PRIMARY KEY(CustomerId) ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1, 'Chris', 25); Query OK, 1 row ...
Read MoreMySQL query to convert a string like "1h 15 min" into 75 minutes?
You can use str_to_date() for this conversion. Let us first create a table −mysql> create table DemoTable ( stringDate varchar(100) ); Query OK, 0 rows affected (0.86 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('1h 15 min'); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values('2h 30 min'); Query OK, 1 row affected (0.21 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+------------+ | stringDate | +------------+ | 1h 15 min | | 2h 30 min | +------------+ 2 rows in set ...
Read MoreMySQL query to convert a string into a month (Number)?
Use the str_to_date() method −select month(str_to_date(yourColumnName, '%b')) from yourTableName;Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, MonthName varchar(100) ); Query OK, 0 rows affected (0.76 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(MonthName) values('Jan'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable(MonthName) values('Mar'); Query OK, 1 row affected (0.13 sec) Display all records from the table using select statement: mysql> select *from DemoTable;Output+----+-----------+ | Id | MonthName | +----+-----------+ | 1 | Jan ...
Read MoreUpdate all rows by prefixing a line to every text in MySQL?
For this, use the CONCAT() function. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Subject varchar(200) ); Query OK, 0 rows affected (1.36 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Subject) values('MySQL'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(Subject) values('MongoDB'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(Subject) values('Java'); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+----+---------+ | Id | Subject | +----+---------+ ...
Read MoreHow to delete '' entry in MySQL?
You can use delete command −delete from yourTableName where yourColumnName='\';Let us first create a table −mysql> create table DemoTable ( FolderName varchar(100) ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values("????"); Query OK, 1 row affected (0.44 sec) mysql> insert into DemoTable values("\"); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+------------+ | FolderName | +------------+ | ???? | | \ ...
Read MoreMySQL query to insert current date plus specific time?
You can use CONCAT() for this. The syntax is as follows −insert into DemoTable values(concat(curdate(), ' yourSpecificTime’));Let us first create a table −mysql> create table DemoTable ( ArrivalDate datetime ); Query OK, 0 rows affected (1.06 sec)Insert some records in the table using insert command. We are adding the current date and time −mysql> insert into DemoTable values(concat(curdate(), ' 10:20:05')); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(concat(curdate(), ' 12:05:00')); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+---------------------+ | ArrivalDate ...
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