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SQLquery~5 mins

CURRENT_DATE and CURRENT_TIMESTAMP in SQL - Cheat Sheet & Quick Revision

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Recall & Review
beginner
What does CURRENT_DATE return in SQL?
CURRENT_DATE returns the current date from the system in the format YYYY-MM-DD, without the time part.
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beginner
What is the difference between CURRENT_DATE and CURRENT_TIMESTAMP?
CURRENT_DATE returns only the date (year, month, day).
CURRENT_TIMESTAMP returns both the date and the current time (hours, minutes, seconds, and fractional seconds).
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beginner
How can you use CURRENT_TIMESTAMP in a SQL query?
You can use CURRENT_TIMESTAMP to get the exact date and time when a query runs.
Example: SELECT CURRENT_TIMESTAMP;
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intermediate
Is CURRENT_DATE affected by time zones in SQL?
Yes, CURRENT_DATE returns the date based on the database server's time zone settings.
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intermediate
Can CURRENT_TIMESTAMP be used to track when a record was inserted?
Yes, CURRENT_TIMESTAMP is often used in INSERT or UPDATE statements to record the exact date and time of the change.
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What does CURRENT_DATE return in SQL?
AThe date of the last update
BThe current time only
CThe current date and time
DThe current date without time
Which SQL function returns both date and time?
ACURRENT_DATE
BCURRENT_TIMESTAMP
CCURRENT_TIME
DNOW()
If you want to store the exact time a record was created, which should you use?
ACURRENT_DATE
BDATE()
CCURRENT_TIMESTAMP
DTIME()
Does CURRENT_DATE include the time of day?
ANo, only date
BYes, always
COnly if specified
DDepends on the database
Which of these is true about CURRENT_TIMESTAMP?
AIt returns date and time
BIt returns only the date
CIt returns only the time
DIt returns the server uptime
Explain what CURRENT_DATE and CURRENT_TIMESTAMP return in SQL and when you might use each.
Think about whether you need just the day or the full date and time.
You got /4 concepts.
    Describe how time zones might affect the values returned by CURRENT_DATE and CURRENT_TIMESTAMP.
    Consider where the database server is located and its clock settings.
    You got /3 concepts.

      Practice

      (1/5)
      1. What does the SQL function CURRENT_DATE return?
      easy
      A. The current date without the time part
      B. The current time without the date part
      C. The current date and time together
      D. The date and time of the last database update

      Solution

      1. Step 1: Understand the function purpose

        CURRENT_DATE is designed to return only the date part of the current moment.

      2. Step 2: Compare with other functions

        CURRENT_TIMESTAMP returns date and time, but CURRENT_DATE excludes time.

      3. Final Answer:

        The current date without the time part -> Option A

      4. Quick Check:

        CURRENT_DATE = date only [OK]
      Hint: CURRENT_DATE returns only date, no time included [OK]
      Common Mistakes:
      • Confusing CURRENT_DATE with CURRENT_TIMESTAMP
      • Expecting time part in CURRENT_DATE
      • Thinking CURRENT_DATE returns last update time
      2. Which of the following is the correct syntax to get the current date and time in SQL?
      easy
      A. SELECT CURRENT_DATE();
      B. SELECT CURRENT_TIMESTAMP;
      C. SELECT NOW();
      D. SELECT CURRENT_TIME;

      Solution

      1. Step 1: Identify correct function syntax

        CURRENT_TIMESTAMP is a standard SQL function and does not require parentheses.

      2. Step 2: Check other options

        CURRENT_DATE() is invalid syntax because CURRENT_DATE does not use parentheses; NOW() is valid in some databases but not standard SQL; CURRENT_TIME returns only time.

      3. Final Answer:

        SELECT CURRENT_TIMESTAMP; -> Option B

      4. Quick Check:

        CURRENT_TIMESTAMP syntax correct without parentheses [OK]
      Hint: CURRENT_TIMESTAMP has no parentheses in standard SQL [OK]
      Common Mistakes:
      • Adding parentheses to CURRENT_DATE or CURRENT_TIMESTAMP
      • Using NOW() assuming it's standard SQL
      • Confusing CURRENT_TIME with date and time
      3. Given the SQL query:
      SELECT CURRENT_DATE, CURRENT_TIMESTAMP FROM dual;

      What will be the output format of CURRENT_TIMESTAMP?
      medium
      A. Only the date in YYYY-MM-DD format
      B. A Unix timestamp number
      C. Only the time in HH:MM:SS format
      D. Date and time in YYYY-MM-DD HH:MM:SS format

      Solution

      1. Step 1: Understand CURRENT_TIMESTAMP output

        CURRENT_TIMESTAMP returns both date and time, typically in the format YYYY-MM-DD HH:MM:SS.

      2. Step 2: Compare with other options

        CURRENT_DATE returns only date; time-only or Unix timestamp are not returned by CURRENT_TIMESTAMP.

      3. Final Answer:

        Date and time in YYYY-MM-DD HH:MM:SS format -> Option D

      4. Quick Check:

        CURRENT_TIMESTAMP = date + time [OK]
      Hint: CURRENT_TIMESTAMP always includes date and time [OK]
      Common Mistakes:
      • Expecting only date from CURRENT_TIMESTAMP
      • Thinking CURRENT_TIMESTAMP returns Unix timestamp
      • Confusing CURRENT_TIMESTAMP with CURRENT_TIME
      4. You wrote this SQL query:
      SELECT CURRENT_DATE(), CURRENT_TIMESTAMP() FROM users;

      But it gives an error. What is the problem?
      medium
      A. CURRENT_DATE and CURRENT_TIMESTAMP should not have parentheses
      B. The table name 'users' is missing quotes
      C. CURRENT_DATE and CURRENT_TIMESTAMP are not valid SQL functions
      D. You must use NOW() instead of CURRENT_TIMESTAMP

      Solution

      1. Step 1: Check function syntax

        In standard SQL, CURRENT_DATE and CURRENT_TIMESTAMP are special functions without parentheses.

      2. Step 2: Validate other parts

        The table name 'users' does not require quotes; both functions are valid; NOW() is optional but not required.

      3. Final Answer:

        CURRENT_DATE and CURRENT_TIMESTAMP should not have parentheses -> Option A

      4. Quick Check:

        No parentheses with CURRENT_DATE/TIMESTAMP [OK]
      Hint: Remove parentheses from CURRENT_DATE and CURRENT_TIMESTAMP [OK]
      Common Mistakes:
      • Adding parentheses to CURRENT_DATE or CURRENT_TIMESTAMP
      • Thinking table names need quotes
      • Replacing CURRENT_TIMESTAMP with NOW() unnecessarily
      5. You want to insert a new record into a table events with a column created_at that stores the exact date and time of insertion. Which SQL statement correctly uses CURRENT_TIMESTAMP for this purpose?
      hard
      A. INSERT INTO events (name, created_at) VALUES ('Launch', CURRENT_DATE);
      B. INSERT INTO events (name, created_at) VALUES ('Launch', CURRENT_TIME);
      C. INSERT INTO events (name, created_at) VALUES ('Launch', CURRENT_TIMESTAMP);
      D. INSERT INTO events (name, created_at) VALUES ('Launch', NOW());

      Solution

      1. Step 1: Identify correct timestamp function

        CURRENT_TIMESTAMP returns the full date and time, perfect for recording insertion time.

      2. Step 2: Compare other options

        CURRENT_DATE lacks time; NOW() may work but is not standard SQL; CURRENT_TIME returns only time, missing date.

      3. Final Answer:

        INSERT INTO events (name, created_at) VALUES ('Launch', CURRENT_TIMESTAMP); -> Option C

      4. Quick Check:

        Use CURRENT_TIMESTAMP for full date and time [OK]
      Hint: Use CURRENT_TIMESTAMP to store date and time on insert [OK]
      Common Mistakes:
      • Using CURRENT_DATE instead of CURRENT_TIMESTAMP
      • Using CURRENT_TIME missing the date part
      • Assuming NOW() is always standard SQL
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