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100 lines
3.1 KiB
Markdown
100 lines
3.1 KiB
Markdown
`CREATE DATABASE <database-name>`
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Example:
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`CREATE DATABASE my-database`
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Discussion:
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`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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### _______________________________
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```
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CREATE [ UNIQUE ] [ NONCLUSTERED | CLUSTERED ] INDEX <index-name>
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ON [ <db-qualifer> ]{ <table-name> | <view-name> }
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( <column-name> [ ASC | DESC ] [ ,...n ] )
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```
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Examples:
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```
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CREATE INDEX ix_vendor-id ON product-vendor (vendor-id);
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CREATE UNIQUE INDEX ix_vendor-id2 ON dbo.product-vendor
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(vendor-id DESC, name ASC, address DESC);
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CREATE INDEX ix_vendor-id3 ON purchasing..product-vendor (vendor-id);
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```
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Discussion:
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Index name cannot start with 'pk-' as these names are internally reserved for primary keys.
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A table or view can only have up to one `CLUSTERED` index, including the primary key for tables.
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The `UNIQUE` option is not available for views.
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### _______________________________
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`CREATE NAMESPACE [<database-name>.]<namespace-name>`
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Example:
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`CREATE NAMESPACE my-namespace`
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### _______________________________
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```
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CREATE TABLE
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[ <db-qualifer> ]<table-name>
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( <column-name> { { <aura> | u( {<aura>) } [DEFAULT <constant_expression>] }
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[ ,... n ] )
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PRIMARY KEY [ NONCLUSTERED | CLUSTERED ] ( <column-name> [ ,... n ] )
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[ { FOREIGN KEY <foreign-key-name> ( <column-name> [ ASC | DESC ] [ ,... n ] )
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REFERENCES [ <namespace-name>. ] <table-name> ( <column-name> [ ,... n ]
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[ ON DELETE { NO ACTION | CASCADE | SET NULL | SET DEFAULT } ]
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[ ON UPDATE { NO ACTION | CASCADE | SET NULL | SET DEFAULT } ] }
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[ ,... n ] ]`
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```
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Example:
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```
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CREATE TABLE order-detail
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(invoice-nbr @ud, line-item @ud, product-id @ud, special-offer-id @ud, message @t)
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PRIMARY KEY CLUSTERED (invoice-nbr, line-item)
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FOREIGN KEY fk-special-offer-order-detail (productid, specialofferid)
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REFERENCES special-offer (product-id, special-offer-id)
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```
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Discussion:
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`PRIMARY KEY` must be unique.
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`SET NULL` only applies to columns defined as `unit`. Columns defined otherwise will be treated as the default `NO ACTION`.
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`SET DEFAULT` applies the column's default constant, if available, otherwise the bunt of the aura.
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### _______________________________
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```
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CREATE TRIGGER [ <db-qualifer> ]<trigger-name>
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ON { <table-name> | <view-name> }
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[ ENABLE | DISABLE ]
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```
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TBD hoon triggers
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Discussion:
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Not for initial release.
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### _______________________________
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`CREATE TYPE <type-name>`
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TBD
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Discussion:
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Probably will be available only at server (ship) level, and so shared by all databases.
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Possibly part of initial or early release.
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### _______________________________
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`CREATE VIEW [ <db-qualifer> ]<view-name> AS <query>`
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Discussion:
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Views are read only.
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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.
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