MongoDB’s import utility – mongoimport – introduced a new parameter that allows you to import CSV data as an array.
The --useArrayIndexFields parameter interprets natural numbers in fields as array indexes when importing CSV or TSV files.
Ian
2 Ways to Replace a Substring in MongoDB
MongoDB 4.4 introduced nine new aggregation pipeline operators, including two new operators for finding and replacing a substring.
The two new operators that allow you to find and replace a substring are the $replaceOne and $replaceAll operators.
Extract the Week Number from a Date in SQL Server (T-SQL)
You can use the T-SQL function DATEPART() to return the week number from a date in SQL Server.
By “week number” I mean the week’s number within the year of the specified date.
Return the ISO Week Number from a Date in SQL Server (T-SQL)
If you need to extract the ISO week number from a date in SQL Server, you can use the iso_week argument when calling the DATEPART() function. You can alternatively use the isowk or isoww arguments to do the same thing.
By “ISO week”, I’m referring to the ISO 8601 date and time standard.
Get the Right Part of a String in SQL Server (T-SQL)
In SQL Server, you can use the RIGHT() function to extract the right part of a string.
It works exactly the same as the LEFT() function (which returns the left part of a string), except that it returns the right part of the string.
Get the Left Part of a String in SQL Server (T-SQL)
In SQL Server, you can use the LEFT() function to extract the left part of a string.
It works exactly the same as the RIGHT() function (which returns the right part of a string), except that it returns the left part of the string.
Create a Database in SQL Server (T-SQL)
Many developers and database administrators create databases using GUI tools such as SQL Server Management Studio (SSMS), Azure Data Studio, etc.
But it can be much quicker to create databases using SQL. This is especially true if you have various environments that you need to recreate the same database on. You can run the same script against each environment, and the database will be created within seconds each time.
In SQL Server, we do this with T-SQL. T-SQL stands for Transact-SQL, and it is SQL Server’s extension to SQL.
Below is an example of using T-SQL to create a database in SQL Server.
Create a Relationship in SQL
In SQL, you create a relationship by creating a foreign key constraint.
More specifically, you have a parent table and a child table. The parent contains the primary key, and the child table contains a foreign key that references the primary key of the parent table.
When you use SQL to create a relationship, you can create the relationship at the time you create the table, or you can create it later (by altering the table). This article covers both scenarios.