Final answer:
Copying data from standard input to tables in databases like MySQL, PostgreSQL, Cassandra, and MongoDB involves using specific commands and tools like LOAD DATA INFILE, COPY, cqlsh, and mongoimport, respectively.
Step-by-step explanation:
The question seems to be asking about how to copy data from standard input devices to tables in various database management systems (MySQL, PostgreSQL, Cassandra, and MongoDB). This process is typically known as importing or loading data into a database. While each database system has its own tools and commands for accomplishing this task, the general idea is to read data from an input source and insert it into the appropriate database table.
- In MySQL, you can use the LOAD DATA INFILE command to read data from a text file and import it into a table.
- PostgreSQL offers the COPY command for importing data from a file or from standard input.
- For Cassandra, the cqlsh command-line tool allows users to execute the COPY command to import data from a CSV file.
- MongoDB has the mongoimport utility which can import data from JSON, CSV, or TSV files into a collection.
When dealing with standard input data, you may need to use shell piping or redirection techniques to direct the input data to the database tool's command. It's important for students to consult the documentation specific to the database they're using for the correct syntax and usage.