please convert a relational database schema  into the  ER diagram Be certain to indicateall relations.  and Write Create command for "Order-Items" table with all constraints

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A:

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SQL Query

Structured Query Language is the full form of SQL. It is one of the standard languages to deal with the relational database. It is used to insert, update, delete, and search the records stored in a RDBMS. The relational databases are created and managed by using SQL.