Bash, the Crucial Exams Chat Bot
AI Bot
Database Structures and Querying Flashcards
CompTIA DataX DY0-001 (V1) Flashcards
Study our Database Structures and Querying flashcards for the CompTIA DataX DY0-001 (V1) exam with 26+ flashcards. View as flashcards, a searchable table, or as a fun matching game.
| Front | Back |
| What are database constraints | Rules enforced on data to ensure accuracy and consistency. |
| What character is typically used to denote wildcards in SQL LIKE queries | %. |
| What does SQL DISTINCT keyword do | Removes duplicate values in the result set. |
| What does SQL stand for | Structured Query Language. |
| What does the SQL clause WHERE do | Filters records based on a specified condition. |
| What does the SQL command DELETE do | Removes data from a table. |
| What does the SQL command INSERT do | Adds new rows to a table. |
| What does the SQL command SELECT do | Retrieves data from a table. |
| What does the SQL command UPDATE do | Modifies existing data in a table. |
| What does the SQL GROUP BY clause do | Aggregates data based on specified columns. |
| What does the SQL HAVING clause do | Applies conditions to groups created by GROUP BY. |
| What is a composite key in a database | A key consisting of two or more columns that uniquely identify a record. |
| What is a data warehouse | A central repository for storing large volumes of business data for analysis. |
| What is a foreign key in a database | A field in one table that links to the primary key in another table. |
| What is a non-relational database | A database that stores data in formats other than tables, such as documents or key-value pairs. |
| What is a normalized database | A database structured to reduce redundancy and improve data integrity. |
| What is a primary key in a database | A unique identifier for a record in a table. |
| What is a stored procedure in SQL | A set of SQL statements stored in the database to perform a specific task. |
| What is ACID compliance in databases | Ensures Atomicity, Consistency, Isolation, and Durability for transactions. |
| What is database denormalization | Adding redundancy to a database for performance improvement. |
| What is the difference between INNER JOIN and OUTER JOIN | INNER JOIN retrieves matching rows from both tables; OUTER JOIN retrieves matching rows plus non-matching rows from one or both tables. |
| What is the difference between OLTP and OLAP | OLTP handles transaction-focused tasks; OLAP is used for analytics and complex queries. |
| What is the difference between structured data and unstructured data | Structured data is organized in tables; unstructured data lacks a pre-defined format. |
| What is the purpose of a transaction in a database | Ensures that a sequence of operations is completed entirely or not at all. |
| What is the purpose of an index in a database | To speed up the retrieval of data. |
| What is the purpose of database schemas | Define the structure and rules of data storage within a database. |
Related Study Materials
About the Flashcards
Flashcards for the CompTIA DataX exam provide a concise review of essential database vocabulary and SQL concepts students are expected to know. Each card offers clear definitions and concise explanations of core items - keys, indexes, constraints, schemas, and differences between relational and non-relational systems - to help build quick recall and confidence before the test.
This deck also covers fundamental SQL operations and clauses used in querying and modifying data, including SELECT, INSERT, UPDATE, DELETE, WHERE, GROUP BY, HAVING, DISTINCT, and wildcard matching, plus joins, transactions and ACID, stored procedures, OLTP vs OLAP, and data warehousing concepts for analytics.
Topics covered in this flashcard deck:
- Primary, foreign, composite keys
- SELECT, INSERT, UPDATE, DELETE
- WHERE, GROUP BY, HAVING, DISTINCT, LIKE
- INNER and OUTER joins
- Transactions and ACID
- Indexes, constraints, schemas