How should I practice Block Type with the Most Children?

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Block Type with the Most Children

Notion● MediumFULLTIMEPHONE SCREEN

Problem statement

Each block can be a root or a direct child of another block. Return the parent block type whose blocks collectively have the largest number of direct children.

Do not count root blocks as children. If several parent types tie, return the alphabetically smallest type. Return block_type and child_count.

Table schema

MySQLPostgreSQLPandas

Use the same input data with any supported language. Open the Schema tab in the editor to see the generated SQL setup or Pandas DataFrames.

blocks

Column	Type	Nullable	Description
block_idPK	Integer	No	—
parent_block_id	Integer	Yes	—
block_type	Text	No	—

Foreign key: parent_block_id → blocks(block_id)

Expected result

Your query or function must return these columns.

Column	Type	Nullable	Description
block_type	Text	No	—
child_count	Integer	No	—

Row order: must match exactly. Numeric tolerance: 0.

Constraints

parent_block_id is null only for root blocks.
At least one child block is present.
Count only direct parent-child relationships.