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In-Depth: In-Memory Database for a Table
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In-Depth: In-Memory Database for a Table

MediumSQL · PostgreSQL

Problem

Design and implement an in-memory database for a single static table. Requirements: All values are numeric. Build a column index during initialization. (remaining requirements hidden)

Asked in the Round 1: coding tech screen stage. Remaining requirements are behind a points wall.

Output

  1. Return every row from static_table.
  2. Include row_id, value_a, value_b, value_c, and value_d.
  3. Order rows by row_id ascending.

Schema

static_table
ColumnTypeDescription
row_idPKBIGINTUnique row identifier
value_aNUMERIC(12,2)First numeric value
value_bNUMERIC(12,2)Second numeric value
value_cNUMERIC(12,2)Third numeric value
value_dNUMERIC(12,2)Fourth numeric value
Tablesstatic_table
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