compound primary key

[sudden geyser]

I need to use a compound primary key in a given table

[opaque dew]

Hi @sudden geyser. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

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Astro's database configuration does not directly support compound primary keys. However, you can establish relationships between multiple columns in two tables using the foreignKeys property. This can be used to create a similar effect to a compound primary key.

Here's an example of how you can use foreignKeys to relate multiple columns:

import { defineTable, column } from 'astro:db';
const Author = defineTable({ firstName: column.text(), lastName: column.text(),});
const Comment = defineTable({ 
    authorFirstName: column.text(), 
    authorLastName: column.text(), 
    body: column.text(), 
    foreignKeys: [ 
        { 
            columns: ['authorFirstName', 'authorLastName'], 
            references: () => [ Author.columns.firstName, Author.columns.lastName ], 
        }, 
    ]
});

In this example, the Comment table has two columns, authorFirstName and authorLastName, that together reference the firstName and lastName columns in the Author table. This establishes a relationship between these two sets of columns.

Please note that this is not exactly the same as a compound primary key, but it can be used to create similar relationships between tables.

For more information, you can refer to the Astro documentation on foreign keys (https://docs.astro.build/en/guides/integrations-guide/db#foreignkeys).

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[sudden geyser]

But i need to set two columns as the way to identify a row in a table, so i need compound pk

@opaque dew But i need to set two columns as the way to identify a row in a table, so i need compound pk

[opaque dew]

Let me check the knowledge base for you. One moment! :books:

---

I'm sorry for any confusion, but based on the provided knowledge sources, Astro's database configuration does not directly support compound primary keys. The primaryKey property in Astro DB is typically used to set a single number or text column as the unique identifier for a table.

Here's an example of how you can set a primary key in Astro DB:

import { defineTable, column } from 'astro:db';
const Comment = defineTable({
  columns: {
    id: column.number({ primaryKey: true }),
    author: column.text(),
    content: column.text({ optional: true }),
    // other columns...
  },
});

In this example, the id column is set as the primary key for the Comment table.

For more complex relationships between tables, you can use the foreignKeys or references properties to establish relationships between multiple columns across tables. However, these are not the same as compound primary keys and may not meet your specific needs.

For more information, you can refer to the Astro documentation on columns (https://docs.astro.build/en/guides/integrations-guide/db#columns) and foreign keys (https://docs.astro.build/en/guides/integrations-guide/db#foreignkeys).

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: