[
  {
    "name": ["Artist"],
    "primary_key": ["ArtistId"],
    "description": "Collection of artists of music",
    "columns": [
      {
        "name": "ArtistId",
        "type": "number",
        "nullable": false,
        "description": "Artist primary key identifier"
      },
      {
        "name": "Name",
        "type": "string",
        "nullable": true,
        "description": "The name of the artist"
      }
    ]
  },
  {
    "name": ["Album"],
    "primary_key": ["AlbumId"],
    "foreign_keys": {
      "Artist": {
        "column_mapping": {
            "ArtistId": "ArtistId"
        },
        "foreign_table": ["Artist"]
      }
    },
    "description": "Collection of music albums created by artists",
    "columns": [
      {
        "name": "AlbumId",
        "type": "number",
        "nullable": false,
        "description": "Album primary key identifier"
      },
      {
        "name": "Title",
        "type": "string",
        "nullable": false,
        "description": "The title of the album"
      },
      {
        "name": "ArtistId",
        "type": "number",
        "nullable": false,
        "description": "The ID of the artist that created this album"
      }
    ]
  },
  {
    "name": ["Customer"],
    "primary_key": ["CustomerId"],
    "foreign_keys": {
      "CustomerSupportRep": {
        "column_mapping": {
          "SupportRepId": "EmployeeId"
        },
        "foreign_table": ["Employee"]
      }
    },
    "description": "Collection of customers who can buy tracks",
    "columns": [
      {
        "name": "CustomerId",
        "type": "number",
        "nullable": false,
        "description": "Customer primary key identifier"
      },
      {
        "name": "FirstName",
        "type": "string",
        "nullable": false,
        "description": "The customer's first name"
      },
      {
        "name": "LastName",
        "type": "string",
        "nullable": false,
        "description": "The customer's last name"
      },
      {
        "name": "Company",
        "type": "string",
        "nullable": true,
        "description": "The customer's company name"
      },
      {
        "name": "Address",
        "type": "string",
        "nullable": true,
        "description": "The customer's address line (street number, street)"
      },
      {
        "name": "City",
        "type": "string",
        "nullable": true,
        "description": "The customer's address city"
      },
      {
        "name": "State",
        "type": "string",
        "nullable": true,
        "description": "The customer's address state"
      },
      {
        "name": "Country",
        "type": "string",
        "nullable": true,
        "description": "The customer's address country"
      },
      {
        "name": "PostalCode",
        "type": "string",
        "nullable": true,
        "description": "The customer's address postal code"
      },
      {
        "name": "Phone",
        "type": "string",
        "nullable": true,
        "description": "The customer's phone number"
      },
      {
        "name": "Fax",
        "type": "string",
        "nullable": true,
        "description": "The customer's fax number"
      },
      {
        "name": "Email",
        "type": "string",
        "nullable": false,
        "description": "The customer's email address"
      },
      {
        "name": "SupportRepId",
        "type": "number",
        "nullable": true,
        "description": "The ID of the Employee who is this customer's support representative"
      }
    ]
  },
  {
    "name": ["Employee"],
    "primary_key": ["EmployeeId"],
    "foreign_keys": {
      "EmployeeReportsTo": {
        "column_mapping": {
          "ReportsTo": "EmployeeId"
        },
        "foreign_table": ["Employee"]
      }
    },
    "description": "Collection of employees who work for the business",
    "columns": [
      {
        "name": "EmployeeId",
        "type": "number",
        "nullable": false,
        "description": "Employee primary key identifier"
      },
      {
        "name": "LastName",
        "type": "string",
        "nullable": false,
        "description": "The employee's last name"
      },
      {
        "name": "FirstName",
        "type": "string",
        "nullable": false,
        "description": "The employee's first name"
      },
      {
        "name": "Title",
        "type": "string",
        "nullable": true,
        "description": "The employee's job title"
      },
      {
        "name": "ReportsTo",
        "type": "number",
        "nullable": true,
        "description": "The employee's report"
      },
      {
        "name": "BirthDate",
        "type": "DateTime",
        "nullable": true,
        "description": "The employee's birth date"
      },
      {
        "name": "HireDate",
        "type": "DateTime",
        "nullable": true,
        "description": "The employee's hire date"
      },
      {
        "name": "Address",
        "type": "string",
        "nullable": true,
        "description": "The employee's address line (street number, street)"
      },
      {
        "name": "City",
        "type": "string",
        "nullable": true,
        "description": "The employee's address city"
      },
      {
        "name": "State",
        "type": "string",
        "nullable": true,
        "description": "The employee's address state"
      },
      {
        "name": "Country",
        "type": "string",
        "nullable": true,
        "description": "The employee's address country"
      },
      {
        "name": "PostalCode",
        "type": "string",
        "nullable": true,
        "description": "The employee's address postal code"
      },
      {
        "name": "Phone",
        "type": "string",
        "nullable": true,
        "description": "The employee's phone number"
      },
      {
        "name": "Fax",
        "type": "string",
        "nullable": true,
        "description": "The employee's fax number"
      },
      {
        "name": "Email",
        "type": "string",
        "nullable": true,
        "description": "The employee's email address"
      }
    ]
  },
  {
    "name": ["Genre"],
    "primary_key": ["GenreId"],
    "description": "Genres of music",
    "columns": [
      {
        "name": "GenreId",
        "type": "number",
        "nullable": false,
        "description": "Genre primary key identifier"
      },
      {
        "name": "Name",
        "type": "string",
        "nullable": true,
        "description": "The name of the genre"
      }
    ]
  },
  {
    "name": ["Invoice"],
    "primary_key": ["InvoiceId"],
    "foreign_keys": {
      "InvoiceCustomer": {
        "column_mapping": {
          "CustomerId": "CustomerId"
        },
        "foreign_table": ["Customer"]
      }
    },
    "description": "Collection of invoices of music purchases by a customer",
    "columns": [
      {
        "name": "InvoiceId",
        "type": "number",
        "nullable": false,
        "description": "Invoice primary key identifier"
      },
      {
        "name": "CustomerId",
        "type": "number",
        "nullable": false,
        "description": "ID of the customer who bought the music"
      },
      {
        "name": "InvoiceDate",
        "type": "DateTime",
        "nullable": false,
        "description": "Date of the invoice"
      },
      {
        "name": "BillingAddress",
        "type": "string",
        "nullable": true,
        "description": "The invoice's billing address line (street number, street)"
      },
      {
        "name": "BillingCity",
        "type": "string",
        "nullable": true,
        "description": "The invoice's billing address city"
      },
      {
        "name": "BillingState",
        "type": "string",
        "nullable": true,
        "description": "The invoice's billing address state"
      },
      {
        "name": "BillingCountry",
        "type": "string",
        "nullable": true,
        "description": "The invoice's billing address country"
      },
      {
        "name": "BillingPostalCode",
        "type": "string",
        "nullable": true,
        "description": "The invoice's billing address postal code"
      },
      {
        "name": "Total",
        "type": "number",
        "nullable": false,
        "description": "The total amount due on the invoice"
      }
    ]
  },
  {
    "name": ["InvoiceLine"],
    "primary_key": ["InvoiceLineId"],
    "foreign_keys": {
      "Invoice": {
        "column_mapping": {
          "InvoiceId": "InvoiceId"
        },
        "foreign_table": ["Invoice"]
      },
      "Track": {
        "column_mapping": {
          "TrackId": "TrackId"
        },
        "foreign_table": ["Track"]
      }
    },
    "description": "Collection of track purchasing line items of invoices",
    "columns": [
      {
        "name": "InvoiceLineId",
        "type": "number",
        "nullable": false,
        "description": "Invoice Line primary key identifier"
      },
      {
        "name": "InvoiceId",
        "type": "number",
        "nullable": false,
        "description": "ID of the invoice the line belongs to"
      },
      {
        "name": "TrackId",
        "type": "number",
        "nullable": false,
        "description": "ID of the music track being purchased"
      },
      {
        "name": "UnitPrice",
        "type": "number",
        "nullable": false,
        "description": "Price of each individual track unit"
      },
      {
        "name": "Quantity",
        "type": "number",
        "nullable": false,
        "description": "Quantity of the track purchased"
      }
    ]
  },
  {
    "name": ["MediaType"],
    "primary_key": ["MediaTypeId"],
    "description": "Collection of media types that tracks can be encoded in",
    "columns": [
      {
        "name": "MediaTypeId",
        "type": "number",
        "nullable": false,
        "description": "Media Type primary key identifier"
      },
      {
        "name": "Name",
        "type": "string",
        "nullable": true,
        "description": "The name of the media type format"
      }
    ]
  },
  {
    "name": ["Playlist"],
    "primary_key": ["PlaylistId"],
    "description": "Collection of playlists",
    "columns": [
      {
        "name": "PlaylistId",
        "type": "number",
        "nullable": false,
        "description": "Playlist primary key identifier"
      },
      {
        "name": "Name",
        "type": "string",
        "nullable": true,
        "description": "The name of the playlist"
      }
    ]
  },
  {
    "name": ["PlaylistTrack"],
    "primary_key": ["PlaylistId", "TrackId"],
    "foreign_keys": {
      "Playlist": {
        "column_mapping": {
          "PlaylistId": "PlaylistId"
        },
        "foreign_table": ["Playlist"]
      },
      "Track": {
        "column_mapping": {
          "TrackId": "TrackId"
        },
        "foreign_table": ["Track"]
      }
    },
    "description": "Associations between playlists and tracks",
    "columns": [
      {
        "name": "PlaylistId",
        "type": "number",
        "nullable": false,
        "description": "The ID of the playlist"
      },
      {
        "name": "TrackId",
        "type": "number",
        "nullable": false,
        "description": "The ID of the track"
      }
    ]
  },
  {
    "name": ["Track"],
    "primary_key": ["TrackId"],
    "foreign_keys": {
      "Album": {
        "column_mapping": {
          "AlbumId": "AlbumId"
        },
        "foreign_table": ["Album"]
      },
      "Genre": {
        "column_mapping": {
          "GenreId": "GenreId"
        },
        "foreign_table": ["Genre"]
      },
      "MediaType": {
        "column_mapping": {
          "MediaTypeId": "MediaTypeId"
        },
        "foreign_table": ["MediaType"]
      }
    },
    "description": "Collection of music tracks",
    "columns": [
      {
        "name": "TrackId",
        "type": "number",
        "nullable": false,
        "description": "The ID of the track"
      },
      {
        "name": "Name",
        "type": "string",
        "nullable": false,
        "description": "The name of the track"
      },
      {
        "name": "AlbumId",
        "type": "number",
        "nullable": true,
        "description": "The ID of the album the track belongs to"
      },
      {
        "name": "MediaTypeId",
        "type": "number",
        "nullable": false,
        "description": "The ID of the media type the track is encoded with"
      },
      {
        "name": "GenreId",
        "type": "number",
        "nullable": true,
        "description": "The ID of the genre of the track"
      },
      {
        "name": "Composer",
        "type": "string",
        "nullable": true,
        "description": "The name of the composer of the track"
      },
      {
        "name": "Milliseconds",
        "type": "number",
        "nullable": false,
        "description": "The length of the track in milliseconds"
      },
      {
        "name": "Bytes",
        "type": "number",
        "nullable": true,
        "description": "The size of the track in bytes"
      },
      {
        "name": "UnitPrice",
        "type": "number",
        "nullable": false,
        "description": "The price of the track"
      }
    ]
  }
]