SQL and PostgreSQL Basics: 10 practice questions

Question 1 of 10

Which statement correctly distinguishes SQL from PostgreSQL?

1. ASQL is a language, while PostgreSQL is a database system that uses it
2. BSQL is a stored table, while PostgreSQL is one row inside it
3. CSQL is a graphical client, while PostgreSQL is its display theme
4. DSQL is the database server process, while PostgreSQL is a single query statement

Question 2 of 10

What problem does PostgreSQL primarily address?

1. ATurning each query result into a new operating-system process for every returned row
2. BReplacing every client application with a database table
3. CFormatting source-code files without storing managed data
4. DStoring and managing data so clients can query or change it

Question 3 of 10

How should PostgreSQL's relationship to standard SQL be understood?

1. AIt makes every PostgreSQL feature identical in every other database engine
2. BIt rejects standard SQL and accepts only graphical commands
3. CIt implements no features beyond a single standard statement
4. DIt supports much of standard SQL and also provides its own extensions

Question 4 of 10

Which sequence represents the core data-work cycle introduced by SQL?

1. ASort one display, replace the database, and remove the language
2. BDefine tables, store rows, query data, and modify stored rows
3. CCreate a network, compile each row, and print server files
4. DOpen a client, rename the server, and discard every table

Question 5 of 10

Which SQL statement is introduced as the way to retrieve table data?

1. AA SELECT statement
2. BA DELETE statement
3. CAn INSERT statement
4. DAn UPDATE statement

Question 6 of 10

Why does the course distinguish general SQL ideas from PostgreSQL-specific behavior?

1. AGeneral SQL requires each client to avoid database operations
2. BPostgreSQL extensions are guaranteed to behave identically in other engines without dialect review
3. CPostgreSQL contains no SQL language and exposes only server files
4. DTransferable concepts coexist with extensions whose syntax or behavior may differ

Question 7 of 10

Which group consists of capabilities documented for PostgreSQL?

1. AComplex queries, foreign keys, updatable views, and transactional integrity
2. BText formatting, image themes, and operating-system package removal
3. CQuery-free storage, untyped screens, mandatory local clients, and no transaction support
4. DA single immutable row, no integrity rules, and no extensions

Question 8 of 10

An analyst wants skills that transfer across SQL products but also needs a concrete system for running queries. Which approach best meets both constraints?

1. APractice general SQL in PostgreSQL and mark PostgreSQL extensions explicitly
2. BTreat every PostgreSQL feature as guaranteed to work unchanged elsewhere
3. CUse SQL terminology without connecting to any database system or checking output
4. DStudy PostgreSQL server files while avoiding SQL statements and results

Question 9 of 10

A team must store changing business records and retrieve selected results, while keeping the request language separate from the managing system. Which model fits?

1. APostgreSQL manages the records, and SQL expresses queries and changes
2. BPostgreSQL formats requests, and a table becomes the SQL language
3. CA result row manages PostgreSQL, and SQL replaces the client application
4. DSQL stores the server files, and PostgreSQL is one SELECT clause

Question 10 of 10

A query works in PostgreSQL, but it may use a product extension and must be moved to another engine without assuming identical behavior. What is the sound next step?

1. AReplace the query with server installation steps before checking its syntax
2. BIdentify the extension and verify the target engine's documented equivalent
3. CAssume SQL support makes every PostgreSQL feature portable without review
4. DClassify PostgreSQL as a statement and the target engine as a column