INSERT INTO multiple rows in MySQL - Step-by-Step Execution

Concept Flow - INSERT INTO multiple rows

Start INSERT

↓

Specify Table

↓

List Columns

↓

Provide Multiple Rows Values

↓

Execute Insert

↓

Rows Added to Table

↓

End

The flow shows how multiple rows are inserted into a table by specifying the table, columns, and multiple sets of values, then executing the insert.

Execution Sample

MySQL

INSERT INTO employees (name, age) VALUES
('Alice', 30),
('Bob', 25),
('Carol', 27);

This query inserts three new rows into the employees table with names and ages.

Execution Table

Step	Action	Values Inserted	Table State After Step
1	Start INSERT INTO employees	None	Table unchanged
2	Specify columns (name, age)	None	Table unchanged
3	Insert row 1	('Alice', 30)	employees: +1 row (Alice, 30)
4	Insert row 2	('Bob', 25)	employees: +2 rows (Alice, 30), (Bob, 25)
5	Insert row 3	('Carol', 27)	employees: +3 rows (Alice, 30), (Bob, 25), (Carol, 27)
6	End INSERT	All rows inserted	Final table has 3 new rows added

💡 All specified rows inserted successfully, query ends.

Variable Tracker

Variable	Start	After 1	After 2	After 3	Final
rows_to_insert	3 rows	2 rows left	1 row left	0 rows left	All inserted
table_state	empty or previous data	1 new row added	2 new rows added	3 new rows added	Final updated table

Key Moments - 2 Insights

Why do we separate multiple rows with commas inside VALUES?

Each row is a separate set of values to insert. Commas separate these sets, as shown in execution_table steps 3-5 where each row is inserted one by one.

What happens if the number of values in a row doesn't match the columns?

The query will fail because each row must have the same number of values as the columns listed. This is implied in step 2 and the values in steps 3-5.

Visual Quiz - 3 Questions

Look at the execution_table, how many rows are inserted after step 4?

A 2 rows

B 1 row

C 3 rows

D 0 rows

💡 Hint

Check the 'Table State After Step' column at step 4 in execution_table.

At which step does the query finish inserting all rows?

A Step 3

B Step 5

C Step 6

D Step 2

💡 Hint

Look for the step labeled 'End INSERT' in execution_table.

If you add a fourth row in VALUES, how does 'rows_to_insert' change after step 3?

A It becomes 1 row left

B It becomes 3 rows left

C It becomes 2 rows left

D It becomes 0 rows left

💡 Hint

Refer to variable_tracker for how 'rows_to_insert' decreases after each inserted row.

Concept Snapshot

INSERT INTO table_name (columns) VALUES (row1), (row2), ...;
- Inserts multiple rows in one query.
- Separate each row with a comma.
- Each row must match column count.
- Efficient for adding many rows at once.

Full Transcript

This visual execution shows how the INSERT INTO statement adds multiple rows to a table. First, the table and columns are specified. Then, multiple sets of values are listed, separated by commas. Each row is inserted one by one, updating the table state. The process ends when all rows are inserted. Key points include matching columns and values count and using commas to separate rows.