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If you want to get only those records that include people who have served on a board of supervisors or a board of directors, the clause you include in your query is database.

A database is a planned grouping of materials that has been organized and is often stored electronically in a computer system. A database management system (DBMS) often oversees a database. The term "database system," often shortened to "database," refers to the combination of data, the DBMS, and the applications attached to it.

To facilitate data processing and querying, the most popular types of databases in use today typically model their data as rows and columns in a set of tables. The data can then be easily handled, updated, regulated and structured. Most database systems use Structured Query Language (SQL) to write and query data.

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