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MySQLi Articles
Page 251 of 341
How to sum time in MySQL by converting into seconds?
To convert time to seconds, use the TIME_TO_SEC() method. Let us first create a table −mysql> create table DemoTable -> ( -> ArrivalTime time -> ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('04:10:00'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('05:20:50'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('06:40:10'); Query OK, 1 row affected (0.18 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+-------------+ | ArrivalTime | +-------------+ | 04:10:00 ...
Read MoreCan we replace a number with a String in a MySQL result set?
Yes, we can do that using the CASE statement. Let us first create a table −mysql> create table DemoTable -> ( -> isMarried boolean -> ); Query OK, 0 rows affected (0.76 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(true); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(false); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(false); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(true); Query OK, 1 row affected (0.19 sec)Display all records from the table ...
Read MoreMySQL query that returns a specific string if column is null?
Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(100) -> ); Query OK, 0 rows affected (0.85 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(NULL); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(NULL); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable;Output+-------+ | Name ...
Read MoreIs there PHP basename() equivalent in MySQL?
If given a string containing a path to a file, the PHP basename() function will return the base name of the file. To get its equivalent in MySQL, you can use SUBSTRING_INDEX(). Let us first create a table −mysql> create table DemoTable -> ( -> Location varchar(200) -> ); Query OK, 0 rows affected (1.02 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('C:\Web\Sum.java'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('E:\WebDevelopment\Image1.png'); Query OK, 1 row affected (0.42 sec)Display all records from the table using select statement ...
Read MoreHow to update a column with the same values (not all) using UPDATE, SET and LIMIT in MySQL?
Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20) -> ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name) values('Carol'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(Name) values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(Name) values('David'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(Name) values('Bob'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(Name) ...
Read MoreConcatenating two strings in MySQL with space?
For this, you can use concat() function from MySQL. Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20), -> Subject varchar(100) -> ); Query OK, 0 rows affected (17.73 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name, Subject) values('John', 'MySQL'); Query OK, 1 row affected (1.19 sec) mysql> insert into DemoTable(Name, Subject) values('Chris', 'SQL Server'); Query OK, 1 row affected (0.88 sec) mysql> insert into DemoTable(Name, Subject) values('Robert', 'MongoDB'); Query OK, 1 row affected ...
Read MoreDisplay records with more than two occurrences in MySQL?
For this, you can use GROUP BY HAVING clause. Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Subject varchar(100) -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Subject) values('MySQL'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(Subject) values('MongoDB'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(Subject) values('MySQL'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(Subject) values('Java'); Query OK, 1 ...
Read MoreAuto insert values into a MySQL table in a range?
For this, you can create a stored procedure. Let us first create a table.mysql> create table DemoTable -> ( -> Value int -> ); Query OK, 0 rows affected (0.55 sec)Following is the query to create a stored procedure to auto insert values to a table from range 10 to 20 −mysql> DELIMITER // mysql> CREATE PROCEDURE AutoInsertValuesToTable() -> BEGIN -> DECLARE startingRange INT DEFAULT 10; -> WHILE startingRange INSERT DemoTable(Value) VALUES (startingRange ); -> SET startingRange = startingRange + 1; -> ...
Read MoreDetermine what a MySQL DB's charset is set to
Let’s say we are creating a database “web” −mysql> SHOW CREATE DATABASE web;This will produce the following output displaying the default charset as well −+----------+-----------------------------------------------------------------------------------------+ | Database | Create Database | +----------+-----------------------------------------------------------------------------------------+ | web | CREATE DATABASE `web` /*!40100 DEFAULT CHARACTER SET utf8 COLLATEutf8_unicode_ci */ | +----------+-----------------------------------------------------------------------------------------+ 1 row in set (0.03 sec)If you want to know ...
Read MoreAveraging a total from a Score column in MySQL with the count of distinct ids?
You can use DISTINCT along with COUNT(). Let us first create a table −mysql> create table DemoTable -> ( -> Id int, -> Score int -> ); Query OK, 0 rows affected (0.95 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10, 90); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(10, 190); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(11, 230); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(11, 130); Query OK, 1 row affected (0.17 ...
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