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Found 4219 Articles for MySQLi
1K+ Views
You can use aggregate function MAX() and MIN() for this.Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Number1 int, Number2 int ); Query OK, 0 rows affected (0.89 sec)Insert records in the table using insert command −mysql> insert into DemoTable(Number1, Number2) values(67, 45); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(Number1, Number2) values(90, 40); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(Number1, Number2) values(80, 43); Query OK, 1 row affected (0.48 sec)Display all records from the table using select ... Read More
131 Views
To modify an existing column’s data type, you can use MODIFY. Let us first create a table −mysql> create table DemoTable ( ClientId varchar(100), ClientName varchar(100), ClientAge int, ClientProjectDeadline timestamp, ClientCountryName varchar(100), isMarried boolean, ClientNumber bigint ); Query OK, 0 rows affected (0.70 sec)Check the description of table −mysql> desc DemoTable;This will produce the following output −+-----------------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------------------+--------------+------+-----+---------+-------+ | ClientId ... Read More
90 Views
You can use UPDATE with DATE_ADD() to update all dates. Let us first create a table −mysql> create table DemoTable ( ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientProjectDueDate date ); Query OK, 0 rows affected (1.19 sec)Insert records in the table using insert command −mysql> insert into DemoTable(ClientProjectDueDate) values('2018-01-21'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(ClientProjectDueDate) values('2019-03-25'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(ClientProjectDueDate) values('2013-11-01'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(ClientProjectDueDate) values('2015-06-14'); Query OK, 1 row affected (0.23 sec)Display all records from ... Read More
111 Views
You can use a CASE statement for this. Let us first create a table −mysql> create table DemoTable ( Number int ); Query OK, 0 rows affected (0.71 sec)Insert records in the table using insert command −mysql> insert into DemoTable values(490); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable values(310); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(540); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(123); Query OK, 1 row affected (0.60 sec) mysql> insert into DemoTable values(1230); Query OK, 1 row affected (0.15 sec) mysql> ... Read More
837 Views
You can use COUNT(*) along with GROUP BY for this. Let us first create a table −mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentAge int ); Query OK, 0 rows affected (0.59 sec)Insert records in the table using insert command −mysql> insert into DemoTable(StudentAge) values(16); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(StudentAge) values(17); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(StudentAge) values(18); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(StudentAge) values(17); Query OK, 1 row affected (0.13 sec) mysql> insert into ... Read More
105 Views
Let us first create a table −mysql> create table DemoTable ( ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientName varchar(30) ); Query OK, 0 rows affected (0.74 sec)Insert records in the table using insert command −mysql> insert into DemoTable(ClientName) values('John'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(ClientName) values('Chris'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(ClientName) values('Robert'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable(ClientName) values('David'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(ClientName) values('Bob'); Query OK, 1 row affected (0.15 sec) mysql> ... Read More
258 Views
You can use STR_TO_DATE() function. Let us first create a table −mysql> create table DemoTable ( AdmissionDate varchar(200) ); Query OK, 0 rows affected (1.19 sec)Insert records in the table using insert command −mysql> insert into DemoTable values('12-01-2019'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('14-12-2016'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('26-04-2018'); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable values('31-05-2013'); Query OK, 1 row affected (0.30 sec)Display all records from the table using select statement −mysql> select * from DemoTable;This will produce the ... Read More
86K+ Views
To create a table with only date column, you can use DATE type. Let us first create a table −mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(20), StudentAdmissionDate DATE ); Query OK, 0 rows affected (0.47 sec)Insert records in the table using INSERT command −mysql> insert into DemoTable(StudentName, StudentAdmissionDate) values('Chris', now()); Query OK, 1 row affected, 1 warning (0.12 sec) mysql> insert into DemoTable(StudentName, StudentAdmissionDate) values('Robert', curdate()); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(StudentName, StudentAdmissionDate) values('David', '2019-05-21'); Query OK, 1 row affected (0.16 sec)Display all ... Read More
10K+ Views
You can use ORDER BY clause or aggregate function MAX() to select the maximum value.Using ORDER BYFollowing is the syntax −select yourColumnName from yourTableName order by yourColumnName desc limit 0, 1;Let us first create a table −mysql> create table DemoTable ( Number int ); Query OK, 0 rows affected (0.52 sec)Insert records in the table using insert command −mysql> insert into DemoTable values(790); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(746); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(480); Query OK, 1 row affected (0.15 sec) mysql> insert into ... Read More
185 Views
You can use a CASE statement for this. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20) ); Query OK, 0 rows affected (1.11 sec)Insert records in the table using insert command −mysql> insert into DemoTable(Name) values('John'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable(Name) values('Carol'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(Name) values('David'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select * from DemoTable;This will produce the following ... Read More