Learn to summarize yoru data using the SQL Aggregates such as count and sum and the GROUP BY and HAVING clauses of the SELECT statement
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Relational Database Concepts: Primary Keys and Entity Integrity
Relational Database Concepts: Natural Keys, Candidate Keys, Surrogate Keys, Secondary Keys
Relational Database Concepts: Data Domain: Physical and Logical
Relational Database Concepts: Foreign Keys and Referential Integrity
Learn Databases Walkthrough
SQL: DDL and DML Part 1 of 4: CREATE TABLE, Primary Keys and INSERT
SQL: DDL and DML Part 2 of 4: ALTER TABLE, and CONSTRAINTs: Check, Unique, and Foreign Key
SQL: DDL and DML Part 3 of 4: INSERT, UPDATE, SELECT and DELETE
SQL: DDL and DML Part 4 of 4: INFORMATION SCHEMA
Master the SQL SELECT statement part 01: Column Projections
Master the SQL SELECT statement part 02: WHERE clause
Master the SQL SELECT statement part 03: CASE