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Found 4219 Articles for MySQLi
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
260 Views
To fetch total number of table rows across databases, use aggregate function SUM() along with INFORMATION SCHEMA. Let us first create a table, which is in “web” database −mysql> create table DemoTable1568 -> ( -> Name varchar(20) -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1568 values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1568 values('Bob'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1568 values('David'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
475 Views
To get the last 30 rows in MySQL, you need to use ORDER BY DESC and then LIMIT 30. The syntax is as follows −select * from yourTableName order by yourColumnName DESC LIMIT 30;Let us first create a table −mysql> create table DemoTable1567 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY -> ); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1567 values(), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
180 Views
For this, you can use CASE WHEN statement. Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(20) -> ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(''); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(''); Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −mysql> ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
71 Views
For this, use INET_ATON() in MySQL. Let’s say our records are in the form of an IP Address. The INET_ATON() method would allow a user to convert IP Address records to the number and then we can use ORDER BY to order them.Let us first create a table −mysql> create table DemoTable -> ( -> IpAddress varchar(50) -> ); Query OK, 0 rows affected (1.36 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('192.168.110.78'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('192.168.110.87'); Query OK, 1 row affected (0.27 ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
169 Views
Let us first create a table −mysql> create table DemoTable -> ( -> FirstName varchar(20) -> ); Query OK, 0 rows affected (0.77 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(''); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Bob'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(''); Query OK, 1 row affected (0.13 sec)Display all records from the table ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
170 Views
Let us first create a table −mysql> create table DemoTable -> ( -> Value int -> ); Query OK, 0 rows affected (3.21 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.78 sec) mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.94 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.41 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values(90); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(70); ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
429 Views
You can use LIMIT 1 OFFSET 1. Let us first create a table −mysql> create table DemoTable -> ( -> Value int -> ); Query OK, 0 rows affected (0.92 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(2); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(4); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(204); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(5); Query OK, 1 row affected ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
559 Views
Let us first create a table −mysql> create table DemoTable -> ( -> EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY , -> EmployeeName varchar(20), -> isMarried tinyint -> ); Query OK, 0 rows affected (0.83 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(EmployeeName, isMarried) values('Chris', NULL); Query OK, 1 row affected (0.76 sec) mysql> insert into DemoTable(EmployeeName, isMarried) values('David', 1); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable(EmployeeName, isMarried) values('Mike', 0); Query OK, 1 row affected (0.69 sec) mysql> insert into DemoTable(EmployeeName, isMarried) values('Sam', NULL); Query OK, ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
465 Views
Following is the error and it occurs when you implement ZEROFILL incorrectly−mysql> create table DemoTable -> ( -> StudentCode int(10) NOT NULL ZEROFILL AUTO_INCREMENT PRIMARY KEY -> ); ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ZEROFILL AUTO_INCREMENT PRIMARY KEY )' at line 3For correct implementation, use the below syntax −SyntaxyourColumnName int(10) ZEROFILL NOT NULL AUTO_INCREMENT PRIMARY KEYLet us first create a table −mysql> create table DemoTable -> ( -> StudentCode int(10) ZEROFILL NOT NULL ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
262 Views
Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> DoubleValue varchar(20) -> ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(DoubleValue) values('80.2, 90.5, 88.90'); Query OK, 1 row affected (0.44 sec) mysql> insert into DemoTable(DoubleValue) values('78.56, 45.80, 88, 45.6'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable(DoubleValue) values('12.34, 90.06, 89.90'); Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will ... Read More