CREATE TABLE Persons (
PersonID INTEGER,
LastName VARCHAR,
FirstName VARCHAR,
Address VARCHAR,
City VARCHAR
);

After running the above query, how many rows of data are in this table (not counting the header row)?

Question

CREATE TABLE Persons (
    PersonID INTEGER,
    LastName VARCHAR,
    FirstName VARCHAR,
    Address VARCHAR,
    City VARCHAR
);

After running the above query, how many rows of data are in this table (not counting the header row)?

BlackTom AI · Accepted Answer

We start by restating what the SQL statement does: a CREATE TABLE command defines a new table named Persons with five columns (PersonID, LastName, FirstName, Address, City) but does not insert any data into it.

Option availability: In this case, there are no answer options provided to choose from, so we cannot evaluate multiple choices. The question asks how many rows of data are in the table after running the CREATE TABLE statement, explicitly excluding any header row.

Key concept: A CREATE TABLE statement creates the table structure in the database schema but does not populate it with data. Until you run INSERT statements (or bulk load, or a SELECT INTO from another data source), the table starts with zero rows.

Reasoning about the row count: Since no INSERTs were performed, the number of data rows stored in the Persons table is zero. The concept of a header row is not relevant to the storage of data in a table within SQL databases—the header (column names) is metadata, not data rows, and is not counted as a row in the data storage.

Potential misconceptions to avoid:
- Thinking the CREATE TABLE statement creates a header row inside the table: there is no such data row created by DDL; the header is metadata presented by tooling, not a stored row.
- Assuming default rows are created automatically: databases do not auto-populate rows from DDL alone.

Overall, from the given statement, the table exists with its defined schema and zero data rows were added, so the row count is 0 once the table has been created and before any INSERT operations.

CREATE TABLE Persons ( PersonID INTEGER, LastName VARCHAR, FirstName VARCHAR, Address VARCHAR, City VARCHAR ); After running the above query, how many rows of data are in this table (not counting the header row)?单项选择题

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CREATE TABLE Persons ( PersonID INTEGER, LastName VARCHAR, FirstName VARCHAR, Address VARCHAR, City VARCHAR ); After running the above query, how many rows of data are in this table (not counting the header row)?单项选择题

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