77 lines
2.4 KiB
Markdown
77 lines
2.4 KiB
Markdown
## Syntax
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`CREATE`: Creates resources/records, similar to `INSERT INTO` in Postgres
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`DEFINE`: Creates namespaces, databases, and logins
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`UPDATE`: Updates resources/records, similar to `UPDATE table_name SET ...` in Postgres
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`DELETE`: Deletes resources/records, similar to `DELETE` in Postgres
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## Examples
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### Basic `SELECT` examples
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```sql
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-- Select all fields from a table
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SELECT * FROM person;
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-- Select specific fields from a table
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SELECT name, address, email FROM person;
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-- Select all fields from a specific record
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SELECT * FROM person:tobie;
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-- Select specific fields from a specific record
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SELECT name, address, email FROM person:tobie;
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-- Alias/rename fields
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SELECT name AS user_name, address FROM person;
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-- Select just a single record
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-- Using the ONLY keyword, just an object for the record in question will be returned.
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-- This, instead of an array with a single object.
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SELECT * FROM ONLY person:john;
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```
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### Advanced `SELECT` expressions
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```SQL
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-- Select nested objects/values
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SELECT address.city FROM person;
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-- Select all nested array values
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-- note the .* syntax works to select everything from an array or object-like values
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SELECT address.*.coordinates AS coordinates FROM person;
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-- Equivalent to
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SELECT address.coordinates AS coordinates FROM person;
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-- Select one item from an array
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SELECT address.coordinates[0] AS latitude FROM person;
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-- Select unique values from an array
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SELECT array::distinct(tags) FROM article;
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-- Select unique values from a nested array across an entire table
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SELECT array::group(tags) AS tags FROM article GROUP ALL;
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-- Use mathematical calculations in a select expression
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SELECT ( ( celsius * 2 ) + 30 ) AS fahrenheit FROM temperature;
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-- Return boolean expressions with an alias
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SELECT rating >= 4 as positive FROM review;
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-- Select manually generated object structure
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SELECT { weekly: false, monthly: true } AS `marketing settings` FROM user;
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-- Select filtered nested array values
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SELECT address[WHERE active = true] FROM person;
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-- Select a person who has reacted to a post using a celebration
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-- You can see the graph as: person->(reacted_to WHERE type='celebrate')->post
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SELECT * FROM person WHERE ->(reacted_to WHERE type='celebrate')->post;
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-- Select a remote field from connected out graph edges
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SELECT ->likes->friend.name AS friends FROM person:tobie;
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-- Use the result of a subquery as a returned field
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SELECT *, (SELECT * FROM events WHERE type = 'activity' LIMIT 5) AS history FROM user;
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```
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### |