urQL/docs/create.md

CREATE DATABASE <database-name>

Example: CREATE DATABASE my-database

Discussion: CREATE DATABASE must be the only command in a script. The script will fail if there are prior commands. As the first command it will succeed and subsequent commands will be ignored.

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CREATE [ UNIQUE ] [ NONCLUSTERED | CLUSTERED ] INDEX <index-name>
  ON [ <db-qualifer> ]{ <table-name> | <view-name> }
  ( <column-name> [ ASC | DESC ] [ ,...n ] )

Examples:

CREATE INDEX ix_vendor-id ON product-vendor (vendor-id);
CREATE UNIQUE INDEX ix_vendor-id2 ON dbo.product-vendor 
  (vendor-id DESC, name ASC, address DESC);
CREATE INDEX ix_vendor-id3 ON purchasing..product-vendor (vendor-id);

Discussion: Index name cannot start with 'pk-' as these names are internally reserved for primary keys. A table or view can only have up to one CLUSTERED index, including the primary key for tables. The UNIQUE option is not available for views.

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CREATE NAMESPACE [<database-name>.]<namespace-name>

Example: CREATE NAMESPACE my-namespace

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CREATE TABLE
  [ <db-qualifer> ]<table-name>
  ( <column-name> { { <aura> | u( {<aura>) } [DEFAULT <constant_expression>] }
    [ ,... n ] )
  PRIMARY KEY [ NONCLUSTERED | CLUSTERED ] ( <column-name> [ ,... n ] )
  [ { FOREIGN KEY <foreign-key-name> ( <column-name> [ ASC | DESC ] [ ,... n ] )
    REFERENCES [ <namespace-name>. ] <table-name> ( <column-name> [ ,... n ]
      [ ON DELETE { NO ACTION | CASCADE | SET NULL | SET DEFAULT } ]
      [ ON UPDATE { NO ACTION | CASCADE | SET NULL | SET DEFAULT } ] }
    [ ,... n ] ]`

Example:

CREATE TABLE order-detail
(invoice-nbr @ud, line-item @ud, product-id @ud, special-offer-id @ud, message @t)
PRIMARY KEY CLUSTERED (invoice-nbr, line-item)
FOREIGN KEY fk-special-offer-order-detail (productid, specialofferid)
REFERENCES special-offer (product-id, special-offer-id)

Discussion: PRIMARY KEY must be unique. SET NULL only applies to columns defined as unit. Columns defined otherwise will be treated as the default NO ACTION. SET DEFAULT applies the column's default constant, if available, otherwise the bunt of the aura.

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CREATE TRIGGER [ <db-qualifer> ]<trigger-name>
  ON { <table-name> | <view-name> }
  [ ENABLE | DISABLE ]

TBD hoon triggers

Discussion: Not for initial release.

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CREATE TYPE <type-name> TBD

Discussion: Probably will be available only at server (ship) level, and so shared by all databases. Possibly part of initial or early release.

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CREATE VIEW [ <db-qualifer> ]<view-name> AS <query>

Discussion: Views are read only. When a column is derived from an arithmetic expression, a function, or a constant; or when two or more columns may otherwise have the same name, typically because of a join; distinct column names must be assigned in the SELECT statement using AS. Otherwise view columns acquire the same names as the columns in the SELECT statement.