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MySQLi Articles
Page 219 of 341
Will "create table table" work in MySQL since we cannot use reserved words as table name?
Let us first see a case wherein we use “create table table” while creating a table. An error will arise −mysql> create table table( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(100) );This will produce the following output i.e. error −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 'table( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(100) )' at line 1As you can see above, the word “table” is a reserved keyword, and we ...
Read MoreHow to select records that begin with a specific value in MySQL?
To select records that begin with a specific value, you need to use LIKE operator. Let us first create a table −mysql> create table DemoTable690( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserValue varchar(100) ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable690(UserValue) values('567890'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable690(UserValue) values('789032'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable690(UserValue) values('567342'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable690(UserValue) values('890678'); Query OK, 1 row affected (0.16 sec)Display ...
Read MoreHow to find missing value between two MySQL Tables?
To find missing value between two MySQL tables, use NOT IN. Let us first create a table −mysql> create table DemoTable1(Value int); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(1); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1 values(2); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable1 values(5); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable1 values(6); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable1 values(8); Query OK, 1 row affected (0.16 sec)Display all records from ...
Read MoreMySQL query to insert data from another table merged with constants?
Let us first create a table −mysql> create table DemoTable1(Name varchar(100)); Query OK, 0 rows affected (0.83 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values('John'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1 values('Chris'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1 values('Robert'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable1;This will produce the following output −+--------+ | Name | +--------+ | John | | Chris | | Robert | +--------+ 3 ...
Read MoreWorking with MySQL WHERE.. OR query with multiple OR usage. Is there an alternative?
Yes, an alternative for MySQL “WHERE.. OR” is using REGEXP.Let us first create a table −mysql> create table DemoTable684(EmployeeInformation text); Query OK, 0 rows affected (0.68 sec)Insert some records in the table using insert command −mysql> insert into DemoTable684 values('John 21 Google'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable684 values('Carol 23 Amazon'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable684 values('Carol 26 Flipkart'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable684 values('David 29 Microsoft'); Query OK, 1 row affected (0.18 sec)Display all records from the table using select statement −mysql> ...
Read MoreUse NOT IN, OR and IS NULL in the same MySQL query to display filtered records
Let us first create a table −mysql> create table DemoTable793( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(100) ); Query OK, 0 rows affected (0.81 sec)Insert some records in the table using insert command −mysql> insert into DemoTable793(StudentName) values('Adam'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable793(StudentName) values('Bob'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable793(StudentName) values(null); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable793(StudentName) values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable793(StudentName) values('Robert'); Query OK, 1 row affected (1.03 sec)Display all records from ...
Read MoreConcatenate string with numbers in MySQL?
To concatenate string with numbers, use the CONCAT() method. Let us first create a table −mysql> create table DemoTable682( Name varchar(100), Age int ); Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert command −mysql> insert into DemoTable682 values('John', 23); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable682 values('Chris', 21); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable682 values('David', 25); Query OK, 1 row affected (0.17 sec) Display all records from the table using select statement:Display all records from the table using select statement -mysql> select *from ...
Read MoreHow to order return duplicate column values only once in MySQL?
To return a column value only once in MySQL, let us first see an example and create a table −mysql> create table DemoTable680(Status varchar(100)); Query OK, 0 rows affected (0.75 sec)Insert some records in the table using insert command −mysql> insert into DemoTable680 values('Busy'); Query OK, 1 row affected (0.36 sec) mysql> insert into DemoTable680 values('At Work'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable680 values('Busy'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable680 values('Blocked'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable680 values('Offline'); Query OK, 1 row affected (0.67 sec) ...
Read MoreHow to order records and fetch some using MySQL LIMIT?
Let us first create a table −mysql> create table DemoTable679(FirstName varchar(100)); Query OK, 0 rows affected (0.44 sec)Insert some records in the table using insert command −mysql> insert into DemoTable679 values('John'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable679 values('Chris'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable679 values('David'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable679 values('Bob'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable679 values('Mike'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable679 values('Sam'); Query OK, 1 row affected (0.15 sec) mysql> insert ...
Read MoreMySQL ORDER BY with custom field value
To set custom field value, use FIND_IN_SET(). Let us first create a table −mysql> create table DemoTable677( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserStatus text ); Query OK, 0 rows affected (1.07 sec)Insert some records in the table using insert command −mysql> insert into DemoTable677(UserStatus) values('BUSY'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable677(UserStatus) values('AT WORK'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable677(UserStatus) values('OFFLINE'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable677(UserStatus) values('BLOCKED'); Query OK, 1 row affected (0.17 sec)Display all records from the table using select ...
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