INSERT INTO multiple rows in SQL - 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

This flow shows how SQL inserts multiple rows into a table by specifying the table, columns, and multiple sets of values.

Execution Sample

SQL

INSERT INTO students (id, name) VALUES
(1, 'Alice'),
(2, 'Bob'),
(3, 'Charlie');

This SQL command inserts three rows into the 'students' table with id and name values.

Execution Table

Step	Action	Values Inserted	Table State After Step
1	Start INSERT INTO students	None	Empty table
2	Specify columns (id, name)	None	Empty table
3	Insert row 1	(1, 'Alice')	[{id:1, name:'Alice'}]
4	Insert row 2	(2, 'Bob')	[{id:1, name:'Alice'}, {id:2, name:'Bob'}]
5	Insert row 3	(3, 'Charlie')	[{id:1, name:'Alice'}, {id:2, name:'Bob'}, {id:3, name:'Charlie'}]
6	End INSERT	All rows inserted	Table has 3 new rows

💡 All specified rows inserted successfully into the table.

Variable Tracker

Variable	Start	After 1	After 2	After 3	Final
table_rows	[]	[{id:1, name:'Alice'}]	[{id:1, name:'Alice'}, {id:2, name:'Bob'}]	[{id:1, name:'Alice'}, {id:2, name:'Bob'}, {id:3, name:'Charlie'}]	[{id:1, name:'Alice'}, {id:2, name:'Bob'}, {id:3, name:'Charlie'}]

Key Moments - 2 Insights

Why do we list multiple sets of values separated by commas?

Each set of values inside parentheses represents one row to insert. Commas separate these rows, as shown in execution_table steps 3 to 5.

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

The SQL engine will give an error because each row must have the same number of values as the columns listed, as implied in step 2 and 3 of the execution_table.

Visual Quiz - 3 Questions

Look at the execution_table, what is the table state after step 4?

A [{id:1, name:'Alice'}]

B [{id:1, name:'Alice'}, {id:2, name:'Bob'}]

C [{id:1, name:'Alice'}, {id:3, name:'Charlie'}]

D Empty table

💡 Hint

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

At which step are all rows inserted into the table?

A Step 6

B Step 5

C Step 3

D Step 2

💡 Hint

Look at the 'Action' and 'Table State After Step' columns in execution_table for the final insertion.

If we add a fourth row, how would variable 'table_rows' change after that insertion?

A It stays the same as after step 3

B It removes the first row

C It adds the new row to the list

D It becomes empty

💡 Hint

Refer to variable_tracker row 'table_rows' and see how it grows after each insertion.

Concept Snapshot

INSERT INTO table_name (columns) VALUES
(row1_values), (row2_values), ...;
- Inserts multiple rows in one command
- Each row's values in parentheses, separated by commas
- Number of values must match columns
- Efficient way to add many rows at once

Full Transcript

This visual execution shows how the SQL INSERT INTO command adds multiple rows to a table. First, the table and columns are specified. Then, multiple sets of values are provided, each representing one row. Each row is inserted step-by-step, updating the table state. The process ends when all rows are added. Key points include matching values to columns and separating rows by commas.