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MySQLi Articles
Page 193 of 341
How to get left substring in MySQL from a column with file path? Display the entire file path string excluding the file name?
To get the left substring, use LEFT() along with substring_index(). For example, let’s say the file path is −“/MyFile/JavaProgram/Hello.java “Here, we will see how to display the entire file path except for the file name i.e. −/MyFile/JavaProgram/Let us first create a table −mysql> create table DemoTable ( FileLocation text ); Query OK, 0 rows affected (0.57 secInsert some records in the table using insert command −mysql> insert into DemoTable values('/MyFile/JavaProgram/Hello.java'); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values('/C/AllPrograms/animation.gif'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('/E/FavFile/ChatProgram.java'); Query OK, 1 row affected ...
Read MoreHow to get the fourth highest value using MySQL query?
To get the fourth-highest value, use LIMIT OFFSET along with ORDER BY. Let us first create a table −mysql> create table DemoTable ( Amount int ); Query OK, 0 rows affected (0.88 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(980); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(670); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(890); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(995); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values(198); Query OK, 1 row affected ...
Read MoreAdd a column count in a MySQL query on the basis of last name records?
Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(100), LastName varchar(100) ); Query OK, 0 rows affected (1.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName, LastName) values('David', 'Miller'); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable(FirstName, LastName) values('Carol', 'Miller'); Query OK, 1 row affected (0.37 sec) mysql> insert into DemoTable(FirstName, LastName) values('John', 'Doe'); Query OK, 1 row affected (0.21 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output ...
Read MoreHow to suppress warnings in MySQL?
To suppress warnings, set SQL_NOTES=0. Let us see an example.At first, we will set SQL_NOTES to 1 −mysql> SET sql_notes = 1; Query OK, 0 rows affected (0.00 sec)Now, let us drop a table which does not exist. As you can see a warning message is now visible −mysql> drop table if exists web.DemoTable; Query OK, 0 rows affected, 1 warning (0.07 sec)To look at the above warning message, you need to just use the SHOW WARNINGS command −mysql> show warnings;This will produce the following output displaying the warning message −+-------+------+-----------------------------------+ | Level | Code | Message ...
Read MoreSort values that contain letters and symbols in custom order with MySQL
For custom order, use ORDER BY FIELD(). Let us first create a table −mysql> create table DemoTable ( Title varchar(100) ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Java_1+'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('MySQL_23+'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('MongoDB++'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('C++_23'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the ...
Read MoreMySQL query to display records on the basis of conditions IS NULL OR !=1;?
Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(100), Score int ); Query OK, 0 rows affected (1.10 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name, Score) values('John', 45); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(Name, Score) values('Chris', null); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(Name, Score) values('David', null); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Name, Score) values('Bob', 1); Query OK, 1 row affected (0.11 sec)Display all records from ...
Read MoreFetch datetime row from exactly past 7 days records in MySQL
For this, you can use the INTERVAL 7 day concept. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, AdmissionDate datetime ); Query OK, 0 rows affected (0.83 sec)Note − Let’s say the current date is 2019-08-23.Insert some records in the table using insert command −mysql> insert into DemoTable(AdmissionDate) values('2019-01-23'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(AdmissionDate) values('2019-08-15'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable(AdmissionDate) values('2019-08-16'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable(AdmissionDate) values('2019-08-24'); Query OK, 1 ...
Read MoreFetching records from a table with NULL and other values on the basis of conditions in MySQL
Let us first create a table −mysql> create table DemoTable ( value1 int, value2 int, value3 int ); Query OK, 0 rows affected (0.70 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(20, 40, null); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(40, 40, null); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values(null, null, null); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+--------+--------+--------+ | value1 | value2 ...
Read MoreMySQL query to ORDER BY records on the basis of modulus result
For this, use ORDER BY with a modulus operator. Let us first create a table −mysql> create table DemoTable ( StudentId int, StudentName varchar(100) ); Query OK, 0 rows affected (1.88 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 'Chris'); Query OK, 1 row affected (0.41 sec) mysql> insert into DemoTable values(101, 'Robert'); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable values(102, 'David'); Query OK, 1 row affected (0.94 sec) mysql> insert into DemoTable values(103, 'Mike'); Query OK, 1 row affected (0.23 sec)Display all records from the table using ...
Read MoreMySQL multiple COUNT with multiple columns?
You can use an aggregate function SUM() along with IF(). Let us first create a table −mysql> create table DemoTable ( FirstName varchar(100), LastName varchar(100) ); Query OK, 0 rows affected (2.80 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Adam', 'Smith'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values('John', 'Smith'); Query OK, 1 row affected (0.36 sec) mysql> insert into DemoTable values('John', 'Doe'); Query OK, 1 row affected (1.38 sec) mysql> insert into DemoTable values('Bob', 'Doe'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('Sam', ...
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