Top linux online terminals to practice commands from the browser

 Linux online terminals to practice commands from the browser

Linux online terminals to practice commands from the browser


Linux online terminals





 









Comments

Post a Comment

Popular posts from this blog

What is a DBAPI ?

Image
 DB-API DB-API definition: - We will sometimes want to interact with our database and use its results in a specific programming language.   - To build web applications or data pipelines in a specific language like (Ruby, Python, Javascript, etc.). - That's where DBAPIs come in. A DB-API:  - A DB-API provides a standard for one programming language (like python) to talk to a relational database server. - Is a low-level library for writing SQL statements that connect to a database.  - Also known as database adapters. - Different DBAPIs exist for every server framework or language + database system. - Database adapters define a standard for using a database (with SQL) and using the results of database queries as input data in the given language. -- Turn a selected (SELECT * from some_table;) list of rows into an array of objects in Javascript for say a NodeJS adapter; or a list of tuples in Python for a Python adapter. Examples across languages and server frameworks: - For Ruby (e.g.
Read more

What Is Relational Databases

Image
What Is Relational Databases  Definitions : -   A database is a collection of data. -    A database system is a system for storing collections of data in some organized way. -    It uses a structure that allows us to identify and access data  in relation  to another piece of data in the database. -    Often, data in a relational database is organized into tables. What is a Relational Database Management System (RDBMS)? -    A relational database management system (RDBMS) is a program that allows you to create, update, and administer a relational database. -   Most relational database management systems use the SQL language to access the database. What is SQL? - SQL ( S tructured  Q uery  L anguage) is a programming language used to communicate with data stored in a relational database management system. - Every relational database system (PostgreSQL, SQLite, MySQL, etc) has its own "flavor" of SQL it implements. - Because they are not 100% compliant with SQL standa
Read more

SQLAlchemy Model.query cheat-sheet

Image
SQLAlchemy  Model  query-cheat-sheet Query Methods Here are some useful query methods to get to know.  - Select records all() MyModel.query.all() Fetches all records from a table. Returns list of objects. first() MyModel.query.first() Fetches just the first result. Returns object or None. - Filtering filter_by() MyModel.query.filter_by(attr='some value') Similar to SELECT * from ... WHERE filter() Examples: MyModel.query.filter(MyOtherModel.some_attr='some value') OrderItem.query.filter(Product.id=3) Similar to filter_by , but instead, you specify attributes on a given Model.-- -- equals: query.filter(User.name == 'ed') -- not equals: query.filter(User.name != 'ed') LIKE : query.filter(User.name.like('%ed%')) ILIKE (case-insensitive LIKE): query.filter(User.name.ilike('%ed%')) IN: query.filter(User.name.in_(['ed', 'wendy', 'jack'])) NOT IN: query.filter(~User.name.in_(['ed', 'wendy', 'jack'
Read more