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MySQLi Articles
Page 241 of 341
Apostrophe replacement in MySQL query?
To replace apostrophe, you can use replace(). Following is the syntax −update yourTableName set yourColumnName=replace(yourColumnName, ''', '');Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Sentence varchar(100) ); Query OK, 0 rows affected (0.17 sec)Insert some records in the table using insert command. Apostrophe is added for the sentence −mysql> insert into DemoTable(Sentence) values('Chris's Father'); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable(Sentence) values('Larry's Mother'); Query OK, 1 row affected (0.06 sec)Display all records from the table using select statement −mysql> select *from ...
Read MoreHow to sum based on field value in MySQL?
To sum based on field values, use aggregate function SUM() along with CASE statement. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Price int, isValidCustomer boolean, FinalPrice int ); Query OK, 0 rows affected (0.23 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Price, isValidCustomer, FinalPrice) values(20, false, 40); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(Price, isValidCustomer, FinalPrice) values(45, true, 10); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(Price, isValidCustomer, FinalPrice) ...
Read MoreHow to display data from a MySQL column separated by comma?
You can use GROUP_CONCAT() function from MySQL to display result as a comma separated list. Let us first create a table −mysql> create table DemoTable ( Value int ); Query OK, 0 rows affected (0.26 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.06 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.06 sec) mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.07 sec) mysql> ...
Read MorePull row with lowest number in a MySQL column?
Use aggregate function MIN() along with GROUP BY for this. Here, we will display the minimum ID for NumberOfProduct . Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, NumberOfProduct int ); Query OK, 0 rows affected (0.19 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(NumberOfProduct) values(40); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(NumberOfProduct) values(40); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable(NumberOfProduct) values(60); Query OK, 1 row affected (0.07 sec) mysql> ...
Read MoreHow to use CHAR_LENGTH() in MySQL CREATE TABLE query?
Use CHAR_LENGTH(yourColumnName) at the time of table creation. Let us first see an example and create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Title varchar(200), `Number_of_characters` int as (char_length(Title)) ); Query OK, 0 rows affected (0.18 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Title) values('Introduction To MySQL'); Query OK, 1 row affected (0.06 sec) mysql> insert into DemoTable(Title) values('Introduction To Java'); Query OK, 1 row affected (0.06 sec) mysql> insert into DemoTable(Title) values('Introduction To MongoDB'); Query OK, 1 row affected (0.04 ...
Read MoreCounting presence of a NOT NULL value in MySQL
To count presence of a NOT NULL value, use aggregate function COUNT(yourColumnName). Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, NumberOfQuestion int, NumberOfSolution int ); Query OK, 0 rows affected (0.20 sec)Insert some records in the table using insert command. Here, some of the values are NULL −mysql> insert into DemoTable(NumberOfQuestion, NumberOfSolution) values(20, 10); Query OK, 1 row affected (0.06 sec) mysql> insert into DemoTable(NumberOfQuestion, NumberOfSolution) values(20, 2); Query OK, 1 row affected (0.04 sec) mysql> insert into DemoTable(NumberOfQuestion, NumberOfSolution) values(20, NULL); Query ...
Read MoreCounting common elements in MySQL?
To count common elements, use COUNT() and GROUP BY. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Number int ); Query OK, 0 rows affected (0.20 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Number) values(10); Query OK, 1 row affected (0.06 sec) mysql> insert into DemoTable(Number) values(20); Query OK, 1 row affected (0.04 sec) mysql> insert into DemoTable(Number) values(20); Query OK, 1 row affected (0.04 sec) mysql> insert into DemoTable(Number) values(30); Query OK, 1 row affected (0.04 sec) ...
Read MoreMySQL Stored Procedure to create a table?
Following is the query to create a stored procedure that creates a table. Here, we are creating a table with three columns, one of them is Id −mysql> DELIMITER // mysql> CREATE PROCEDURE Stored_Procedure_CreatingTable() BEGIN create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserFirstName varchar(20), UserLastName varchar(20) ); END; // Query OK, 0 rows affected (0.16 sec) mysql> DELIMITER ;Now you can call stored procedure with the help of CALL command −mysql> call Stored_Procedure_CreatingTable(); ...
Read MoreLower case column names with MySQL SELECT?
Let us first create a table −mysql> create table DemoTable ( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserFirstName varchar(20), UserLastName varchar(20), UserAge int, UserCountryName varchar(20) ); Query OK, 0 rows affected (0.27 sec)Now check the description of table.mysql> desc DemoTable;This will produce the following output −+-----------------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------------+-------------+------+-----+---------+----------------+ | UserId | int(11) | NO | PRI ...
Read MoreMySQL Select when a grouped record has multiple matching strings?
You can use regular expression for this. Let us first create a table −mysql> create table DemoTable ( ProductId int NOT NULL AUTO_INCREMENT PRIMARY KEY, ProductName varchar(20) ); Query OK, 0 rows affected (0.19 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(ProductName) values('Product-1'); Query OK, 1 row affected (0.05 sec) mysql> insert into DemoTable(ProductName) values('Product2'); Query OK, 1 row affected (0.06 sec) mysql> insert into DemoTable(ProductName) values('Product1'); Query OK, 1 row affected (0.04 sec) mysql> insert into DemoTable(ProductName) values('Product-3'); Query OK, 1 row affected (0.05 sec) mysql> ...
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