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MySQLi Articles
Page 29 of 341
Sort a column in descending order after placing argument in MySQL IN()?
For this, use FIELD() function with DESC. Let us first create a table −mysql> create table DemoTable -> ( -> Number int -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(50); Query OK, 1 row ...
Read MoreDisplay records from two columns based on comparison in MySQL?
Let us first create a table −mysql> create table DemoTable -> ( -> Num1 int, -> Num2 int -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 200); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(200, 100); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(300, 400); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(400, 300); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(500, 600); Query OK, 1 ...
Read MoreCount only null values in two different columns and display in one MySQL select statement?
Use IS NULL to test for NULL value. Let us first create a table −mysql> create table DemoTable -> ( -> Number1 int, -> Number2 int -> ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1, NULL); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(NULL, NULL); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(3, NULL); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(NULL, 90); Query OK, 1 row affected ...
Read MoreMySQL query to remove special characters from column values?
Let us first create a table −mysql> create table DemoTable -> ( -> StudentId varchar(100) -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('STU#123'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('STU#567'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('STU#98494'); Query OK, 1 row affected (0.19 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+-----------+ | StudentId | +-----------+ | STU#123 | | STU#567 ...
Read MoreChange multiple columns in a single MySQL query?
For this, use UPDATE and REPLACE() in MySQL. Let us first create a table −mysql> create table DemoTable -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(100), -> StudentCountryName varchar(100) -> ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(StudentName, StudentCountryName) values('John', 'US'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql select *from DemoTable;OutputThis will produce the following output −+-----------+-------------+--------------------+ | StudentId | StudentName | StudentCountryName | +-----------+-------------+--------------------+ | ...
Read MoreHow to set a string with hyphen and numbers in MySQL varchar?
To set a string with hyphen and numbers, you need to use single quotes. For example, 'Customer-1234-899', 'Customer-9383-901', etc.Let us first create a table −mysql> create table DemoTable -> ( -> CustomerId varchar(100) -> ); Query OK, 0 rows affected (0.70 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Customer-1234-899'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Customer-8373-900'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Customer-9383-901'); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTableOutputThis ...
Read MoreExtract the middle part of column values in MySQL surrounded with hyphens and display in a new column?
Use the SUBSTR() method to extract the middle part of column values surrounded with hyphens, for example, “11-84848-11”.Let us first create a table −mysql> create table DemoTable -> ( -> Number varchar(100), -> Number1 varchar(100) -> ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Number) values('11-84848-11'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(Number) values('22-99999-22'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+-------------+---------+ | Number ...
Read MoreConvert hex string to number in MySQL?
Use the CONV() method to convert hex string to number −select CONV(yourColumnName, 16, 10) AS anyAliasName from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> HexString varchar(100) -> ); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('A'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable values('F'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('B'); Query OK, 1 row affected (0.55 sec) mysql> insert into DemoTable values('ABC'); Query OK, 1 row affected (0.11 sec)Display ...
Read MoreMySQL query to display a substring before a special character in a string
Use the LOCATE() and SUBSTRING() method for this in MySQL. Let us first create a table −mysql> create table DemoTable -> ( -> Title text -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Introduction To Java'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Introduction - To MySQL'); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+-------------------------+ | Title ...
Read MoreGet the substring of a column in MySQL
Use the SUBSTR() method to get the substring of a column.Let us first create a table −mysql> create table DemoTable -> ( -> Title text -> ); Query OK, 0 rows affected (0.74 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('This is a MySQL Database'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Java is an Object Oriented Programming Language'); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable ;OutputThis will produce the following output −+-------------------------------------------------+ | Title ...
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