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MySQL Articles
Page 121 of 355
What MySQL INSERT() function returns if the number of characters to be removed exceeds the number of characters available in original string?
In case if the number of characters to be removed exceeds the number of characters available in original string then MySQL INSERT() function will continue to remove the characters until the end of the original string.Examplemysql> Select INSERT('myteststring',3,15,'original'); +----------------------------------------+ | INSERT('myteststring',3,15,'original') | +----------------------------------------+ | myoriginal | +----------------------------------------+ 1 row in set (0.00 sec)
Read MoreHow can we use MySQL LPAD() and RPAD() functions in the same query for padding the string to both sides, left and right, of the original string?
For achieving this, we must have to use one of the functions as the 1st argument of the other function. In other words, either RPAD() function would be the 1st argument of LPAD() function or LPAD() function would be the 1st argument of RPAD() function. It can be understood with the help of the following exampleExamplemysql> Select RPAD(LPAD(' My name is Ram ', 23, '* '), 30, '* '); +------------------------------------------------+ | RPAD(LPAD(' My name is Ram ', 23, '* '), 30, '* ') | +------------------------------------------------+ | * * * * My name is Ram * * * * ...
Read MoreWhat MySQL returns if we provide an empty string for padding with other string in LPAD() or RPAD() functions?
Suppose if we provide an empty string for padding on LPAD() or RPAD() functions then MySQL will return NULL as output. Following example will demonstrate it −Examplemysql> Select LPAD('ABCD',22,''); +--------------------+ | LPAD('ABCD',22,'') | +--------------------+ | NULL | +--------------------+ 1 row in set (0.00 sec) mysql> Select RPAD('ABCD',22,''); +--------------------+ | RPAD('ABCD',22,'') | +--------------------+ | NULL | +--------------------+ 1 row in set (0.00 sec)
Read MoreHow MySQL evaluates the blank line between two lines written in the text file while importing that text file into MySQL table?
Suppose if there is a blank line between two line written in the text file then MySQL evaluates it as the data line while importing that text file into MySQL table. It can be understood with the help of the following example −ExampleSuppose we are having a blank line between two lines in a text file named ‘A.txt’ as follows −105, Chum, USA, 11000 106, Danny, AUS, 12000Now we can write the following query to import the data from text file into MySQL table −mysql> LOAD DATA LOCAL INFILE 'd:\A.txt' INTO table employee10_tbl FIELDS TERMINATED BY ', '; Query OK, ...
Read MoreHow to insert new string within a string subsequent to removing the characters from the original string by using MySQL function?
We can use MySQL INSERT() function to insert new string within a string after removing the characters from the original string.SyntaxINSERT(original_string, @pos, @len, new_string)Here, original_string is the string in which we want to insert new string at the place of some specific number of characters.@pos is the position at which the insertion of new string should start.@len is the number of characters should delete from the original string. The starting point of deletion of characters is value of @pos.New_string is the string we want to insert into the original string.Examplemysql> Select INSERT('Yash Sharma', 5, 7, ' Pal'); +----------------------------------+ | ...
Read MoreHow can we upload the changed value, rather than written in a text file, of column(s) while importing that text file into MySQL table?
Suppose if we want to upload the changed value rather than the value written in a text file then we need to use user variables along with the SET command. It can be understood with the help of the following example −ExampleSuppose we are having the following data in ‘A.txt’ −105, Chum, USA, 11000 106, Danny, AUS, 12000But we want to upload the value of salary after adding 500 to it at the time of importing it without changing the value of salary in a text file then it can be done with the help of the following query by ...
Read MoreWhat MySQL returns on running the INSERT INTO statement without giving the column name and values both?
When we run the INSERT INTO statement without giving the columns name/s and values both then MySQL will store NULL as the value of the column/s of table. Consider the example given below in which we have created a table ‘Student’ with the following query −mysql> Create table Student(RollNO INT, Name Varchar(20), Class Varchar(15)); Query OK, 0 rows affected (0.17 sec)Now, we can run INSERT INTO statement without giving the columns name/s and values both as follows −mysql> Insert into Student() Values(); Query OK, 1 row affected (0.02 sec)We can see from the query below MySQL stores NULL as the ...
Read MoreHow can we change the default MySQL database to the given database?
Suppose currently we are using a tutorial database so it would be the default MySQL database for subsequent queries. Now, with the help of USE db_name statement, we can change the default database to other given database subsequent queries.mysql> USE Sample Database changedThe database has been changed to Sample from the tutorial. To verify this we can run the following command −mysql> select database(); +------------+ | database() | +------------+ | sample | +------------+ 1 row in set (0.00 sec)
Read MoreWhat is the use of escape character () in text file while importing the data from text file to MySQL table?
Use of escape character (\) would become very essential when we want to insert a comma or any other character between the values of a filed. It can be understood with the help of an example. Suppose we want to import the data from a text file named A.txt, having the following data, into a MySQL table −id, Name, Country, Salary 105, Chum, Marsh, USA, 11000 106, Danny, Harrison, AUS, 12000Here, we can see that the filed name has two values first name, last name separated by a comma. Now, the ...
Read MoreHow can we use MySQL INSTR() function with WHERE clause?
When we use INSTR() function with MySQL WHERE clause, we need to provide column name of the table as the first argument and the substring as second argument along with a comparison operator. Following is an example using ‘Student’ table to demonstrate it −ExampleSuppose we have the following values in ‘Student’ table −mysql> Select * from Student; +------+---------+---------+-----------+ | Id | Name | Address | Subject | +------+---------+---------+-----------+ | 1 | Gaurav | Delhi | Computers | | 2 | Aarav | Mumbai | History | | 15 | Harshit | ...
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