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MIDDLE

Middle Database Developer | SQL | Customer Data

Contains following tasks:

1) Choice questions - assessing knowledge of SQL, MySQL

2) Task [level: Medium] - SQL | Customer Data - Find all the customers whose first and last names are not unique in this database, as well as the number of times each first and last name pair appears in the database.

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Tasks details:

SQL exercise

middle level
Skills: SQL MSSQL oracle PostgreSQL HSQLDB MySQL

SQL | Customer Data

Choice questions

middle level
Skills: SQL

5 choice questions