![]() This results in a SQL injection UNION attack. When an application is vulnerable to SQL injection and the results of the query are returned within the application's responses, the UNION keyword can be used to retrieve data from other tables within the database. Extracting data via verbose error messages.Inferring information using conditional errors.Retrieving multiple values in a single column.Finding columns with a useful data type.Detecting SQL injection vulnerabilities.You can view EDUCBA’s recommended articles for more information. We hope that this EDUCBA information on “MySQL Union” was beneficial to you. In the result set of the UNION table, the column name will be the same as the column name of the first select statement.If you don’t want the duplicate rows to be ignored, we can do it with the “UNION ALL”. The number of fields in the table should be the same, and the data type of the columns should be the same.The output of the “UNION” will be without duplicate rows. MySQL Union combines the output of two or more “SELECT” statements. ![]() Things that need to remember are as below: – Insert into st_marks_bkup values ('Music Class', 67) Ī screenshot for the above is given below: – Insert into st_marks_bkup values ('Art', 43) Insert into st_marks_bkup values ('Chemistry', 67) Insert into st_marks_bkup values ('Physics', 78) Insert into st_marks_bkup values ('Mathematics', 93) Insert into st_marks_bkup values ('English', 98) Insert into st_marks values ('Music Class', 67) īackup table:- create table St_marks_bkup Insert into st_marks values ('Chemistry', 67) Insert into st_marks values ('Physics', 78) Insert into st_marks values ('Mathematics', 93) Insert into st_marks values ('English', 98) As we know that the UNION doesn’t give us duplicates the output of the tables should be rows of only one table: – Now, let us consider the backup table and check if all the rows have been inserted into the table “st_marks”. “st_marks_bkup” is a backup table that has some data in it. Here we have “st_marks” and “st_marks_bkup”. Now let us see another example of real-time. But in the result set, UNION ignores the duplicate because we have only one row of data, “1”.
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