Found 4219 Articles for MySQLi

In MySQL “Where 1=1” results in all the rows of a table as this statement is always true. An example to better unerstand this statement is given as follows −First, a table is created with the help of the create command. This is given as follows −mysql> CREATE table WhereConditon -> ( -> id int, -> name varchar(100) -> ); Query OK, 0 rows affected (0.43 sec)After successfully creating a table, some records are inserted with the help of insert command The query for this is given as follows −mysql> INSERT into WhereConditon values(1, 'John'); Query OK, 1 row affected ... Read More

The max_allowed_packet size is a session variable and is also a read only variable.To check what is the present value of max_allowed_packet, the command show variables is used. It is given as follows −mysql> show variables like 'max_allowed_packet';The following is the output+--------------------+---------+ | Variable_name | Value | +--------------------+---------+ | max_allowed_packet | 4194304 | +--------------------+---------+ 1 row in set (0.04 sec)The value of the max_allowed_packet can be changed in the ‘my.ini’ file on the client side. The query for that is given as follows −max_allowed_packet = 4567890; Now, the value can be changed globally ... Read More

To update a column value, the update command as well as the replace method can be used. The steps to better understand these are given as follows −First create a table with the help of the create command. This is given as follows −mysql> CREATE table DemoOnReplace -> ( -> Id int, -> Name varchar(200) -> ); Query OK, 0 rows affected (0.63 sec)After successfully creating a table, some records are inserted with the help of the insert command. This is shown below −mysql> INSERT into DemoOnReplace values(1, 'John'); Query OK, 1 row affected (0.10 sec) mysql> INSERT into ... Read More

To see all the foreign keys to a table or column, the referenced_column_name command is used.First, two tables are created and then related with the help of the foreign key constraint.Creating the first table −mysql> CREATE table ForeignTable -> ( -> id int, -> name varchar(200), -> Fk_pk int -> ); Query OK, 0 rows affected (0.43 sec)After creating the first table successfully, the second table is created as follows −mysql> CREATE table primaryTable1 -> ( -> Fk_pk int, -> DeptName varchar(200), -> Primary key(Fk_pk) -> ); Query OK, 0 rows affected (0.48 sec)Now, both the tables are related with ... Read More

The auto_increment is a default property that automatically increments the newly added record by 1. The auto_increment can be changed from the beginning as well. The procedure for that is given below −First, a table is created.mysql> CREATE table DemoAuto -> ( -> id int auto_increment, -> name varchar(100), -> primary key(id) -> ); Query OK, 0 rows affected (0.47 sec)After that the alter table command is used to change the starting number of auto_incremnt which starts from 1 by default. The starting value is changed to 100.mysql> alter table DemoAuto auto_increment = 100; Query OK, 0 rows affected (0.24 ... Read More

The schema_name command is used to check if a MySQL database exists or not. The syntax of this command is as follows −select schema_name from information_schema.schemata where schema_name = 'database name';Now, the above command is used to check whether the database exists or not. The query for that is as follows −Case 1 − The database exists.mysql> select schema_name from information_schema.schemata where schema_name = 'business'; The output obtained is as follows −+-------------+ | SCHEMA_NAME | +-------------+ | business | +-------------+ 1 row in set (0.00 sec)Case 2 − The database does not exist.mysql> select schema_name from information_schema.schemata ... Read More

To understand error 1452, first we need to create a table and relate that to another table with the help of a foreign key constraint.Creating the first table −mysql> CREATE table ForeignTable -> ( -> id int, -> name varchar(200), -> Fk_pk int -> ); Query OK, 0 rows affected (0.43 sec)After creating the first table successfully, we will create the second table −mysql> CREATE table primaryTable1 -> ( -> Fk_pk int, -> DeptName varchar(200), -> Primary key(Fk_pk) -> ); Query OK, 0 rows affected (0.48 sec)Now, we have created both tables. Then both the tables are related with the ... Read More

To get the maximum of two values in MySQL, we can use the predefined function “greatest”. The syntax of greatest() function is as follows −SELECT greatest(value1, value2);Applying the above query, To get the maximum value from two values. The query is as follows −Case 1We are giving both the values int.mysql> SELECT greatest(100, -300); After executing the above query, we will get the following output+--------------------+ | greatest(100, -300) | +--------------------+ | 100 | +--------------------+ 1 row in set (0.00 sec)Case 2We are giving both the ... Read More

We can modify a column size with the help of ALTER command. Let us see how to modify column size. Suppose we are defining any column with some size. At the time of inserting if we are giving more size in comparison to the one we defined, then an error will generate.The above problem can be reduced while modifying the size. For more understanding, we can create a table with the help of CREATE command −mysql> CREATE table ModifyColumnNameDemo -> ( -> id int, -> StudentName varchar(10) -> ); Query OK, 0 rows affected (0.45 sec)After creating a table successfully, ... Read More

To test whether a row exists in a MySQL table or not, use exists condition. The exists condition can be used with subquery. It returns true when row exists in the table, otherwise false is returned. True is represented in the form of 1 and false is represented as 0.For better understanding, firstly we will create a table with the help of CREATE command. The following is the query to create a table −mysql> CREATE table ExistsRowDemo -> ( -> ExistId int, -> Name varchar(100) -> ); Query OK, 0 rows affected (0.53 sec)After creating the table successfully, we will ... Read More