Tech Library For Developers
In this post, we will discuss how to create a Cumulative Sum Column in MySQL where we can use any user-defined variable for keeping the track of the sum and continue to add on. And even we can use subquery and a join. And here we will discuss both ways to achieve our desired output … Read more
In this post, we will discuss How can I output MySQL query results in CSV files format which we can do using select into outfile statement before giving the name of the file along with the extension. Files Extraction in CSV Format We can get a csv format of the data stored in a database … Read more
In this post, we will discuss How to use multiple databases in Laravel which we can perform using separate database connections for each database in the config/ database.php file for the same we have given an example of code to understand it better. Laravel We have given an example here to understand it in better … Read more
In this post, we will discuss How to fill in missing dates in range MySQL for which we need to combine a subquery and union statement where we use the subquery to generate the list of all the lists of required ranges as we want and the union statement for combining the exported list with … Read more
In this post, we will explore some SQL query return data from multiple tables which we can perform using join in Mysql, and based on the common columns we can retrieve the data from multiple tables, So for the same we have taken an example below and performed the desired operation. Return Data From Multiple … Read more
In this post, we will learn the difference between INSERT IGNORE” vs “INSERT ON DUPLICATE KEY UPDATE” where both of them are used for inserting the data in a table with a slit difference that is in case of insert ignore we ignore the record which violates the rule or contain the table, for example, … Read more
In this post, we will learn how to SQL split values to multiple rows which we can perform using the union operator and the select statement of MySQL. For the same, we have given an example below. Use Of Union As we know in SQL, you can split value in a column into multiple rows … Read more
In this post, we will learn How can I do ‘insert if not exists in MySQL and update if exist where for data or record to add new if it does not exist we can perform using insert into, Whereas we can make changes in existing data or we can update the existing data by … Read more
In this post, we will learn How to do a regular expression replacement in MySQL Where regexp replaces () is used to replace a pattern in a string with another string using a regular expression which we will see as an example here. Regular Expression Replacement For replacing a pattern in a string with another … Read more
In this post, we will learn How can I SELECT rows with MAX (Column value), and PARTITION by another column in MYSQL which we can perform using the row number function to select the rows that have the highest values in a column and in addition to that it has a division too and that … Read more
