PostgreSQL SELECT Statement Syntax
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Questions and Answers

What is the purpose of the comma in the SELECT list?

  • To specify the FROM clause
  • To separate two columns in the list of columns (correct)
  • To indicate the end of the SELECT statement
  • To separate the table name from the column name

    • What happens if you omit the FROM clause in the SELECT statement?

  • The SELECT statement is executed without any issues (correct)
  • The SELECT statement only returns the column names
  • An error is generated
  • The SELECT statement returns data from all tables

    • What is the purpose of the asterisk (*) in the SELECT statement?

  • To separate two columns in the list of columns
  • To specify a list of columns
  • To select data from all columns in the table (correct)
  • To specify the table name

    • In what order does PostgreSQL evaluate the clauses in the SELECT statement?

    <p>FROM clause before the SELECT clause</p> Signup and view all the answers

    What is the case sensitivity of SQL keywords in PostgreSQL?

    <p>SQL keywords are case-insensitive</p> Signup and view all the answers

    What is the purpose of the SELECT statement in PostgreSQL?

    <p>To retrieve data from a table</p> Signup and view all the answers

    What is the command to switch to the dvdrental database in PostgreSQL?

    <p>\c dvdrental</p> Signup and view all the answers

    What is the purpose of the semicolon at the end of an SQL statement in PostgreSQL?

    <p>It is used to indicate the conclusion of an SQL statement</p> Signup and view all the answers

    What is the result of running the SQL query SELECT first_name FROM customer;?

    <p>A list of first names of all customers in the customer table</p> Signup and view all the answers

    What is the difference between SELECT first_name, last_name, email FROM customer; and SELECT * FROM customer;?

    <p>The first query returns only the specified columns, while the second query returns all columns</p> Signup and view all the answers

    What is the command to connect to the PostgreSQL server using the postgres user?

    <p>psql -U postgres</p> Signup and view all the answers

    What is the name of the table being queried in the examples provided?

    <p>customer</p> Signup and view all the answers

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