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table-def-item column-definition column-definition | table-constraint column data-type [ DEFAULT { literal | USER | NULL } ] [ column-constraint-list ]
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SQL: The Complete Reference
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column-constraint [ CONSTRAINT constraint-name ] { NOT NULL | uniqueness | foreign-key-ref | check-constr } [ constraint-timing ] [ CONSTRAINT constraint-name ] { uniqueness | foreign-key-constr | check-constr } [ constraint-timing ] UNIQUE ( col-list ) | PRIMARY KEY ( col-list ) FOREIGN KEY ( col-list ) foreign-key-ref REFERENCES table [ ( col-list ) ] [ MATCH FULL | PARTIAL ] [ ON DELETE ref-action ] CASCADE | SET NULL | SET DEFAULT | NO ACTION CHECK ( search-condition ) [ INITIALLY IMMEDIATE | INITIALLY DEFERRED ] [ [ NOT ] DEFERRABLE ] SELECT | DELETE | UPDATE [ ( colmn-list ) ] INSERT [ ( colmn-list ) ] CASCADE | RESTRICT
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The "singleton SELECT" statement retrieves a single row of data into a set of host variables (embedded SQL) or stored procedure variables:
SELECT [ ALL | DISTINCT ] { select-item-list | * } INTO variable-list FROM table-ref-list [ WHERE search-condition ]
The "interactive SELECT" statement retrieves any number of rows of data in an interactive SQL session (multirow retrieval from embedded SQL or stored procedures requires cursor-based statements):
SELECT [ ALL | DISTINCT ] { select-item-list | * } INTO host-variable-list
Appendix C:
SQL Syntax Reference
[ [ [ [
FROM table-ref-list WHERE search-condition ] GROUP BY column-ref-list ] HAVING search-condition ] ORDER BY sort-item-list ]
These statements modify the data in the database:
INSERT INTO table [ ( column-list ) ] { VALUES ( insert-item-list ) | query-expr } DELETE FROM table [ WHERE search-condition ] UPDATE table SET set-assignment-list [ WHERE search-condition ]
APPENDIXES
Transaction Processing Statements
These statements signal the end of a SQL transaction:
COMMIT [ WORK ] ROLLBACK [ WORK ]
Cursor-Based Statements
These programmatic SQL statements support data retrieval and positioned update of data:
DECLARE cursor [ SCROLL ] CURSOR FOR query-expr [ ORDER BY sort-item-list ] [ FOR { READ ONLY | UPDATE [ OF column-list ] } ] OPEN cursor CLOSE cursor FETCH [ [ fetch-dir ] FROM ] cursor INTO variable-list DELETE FROM table WHERE CURRENT OF cursor UPDATE table SET set-assignment-list WHERE CURRENT OF cursor
SQL: The Complete Reference
The optional fetch direction (fetch-dir) is specified as the following; and row-nr can be specified as a variable or a literal.
NEXT | PRIOR | FIRST | LAST | ABSOLUTE row-nr | RELATIVE row-nr
Query Expressions
The SQL2 standard provides a rich set of expressions for specifying queries, from simple queries to more complex query expressions that use relational database operations to combine the results of simpler queries. The basic query specification has the form:
SELECT [ ALL | DISTINCT ] { select-item-list | * } FROM table-ref-list [ WHERE search-condition ] [ GROUP BY column-ref-list ] [ HAVING search-condition ]
The table references (tbl-ref ) in the FROM clause can be: I A simple table reference, consisting of a (possibly qualified) table name. I A derived table reference, consisting of a subquery (see the text that follows) that produces a table-valued result. Not all DBMS brands allow table-valued subqueries to appear in the FROM clause. I A joined table reference (see the text that follows) that combines data from two or more tables using relational OUTER JOIN, INNER JOIN, or other join operators. Not all DBMS brands allow join specifications to appear in the FROM clause. Joined tables are specified according to the SQL2 standard as follows; in practice, there is wide variation in the specific types of joins supported by individual DBMS brands and the syntax used to specify various join types:
Join Type
joined-table
Syntax
inner-join | outer-join | union-join | cross-join | ( joined-table )
Appendix C:
SQL Syntax Reference
Join Type
inner-join outer-join
Syntax
table-ref [ NATURAL ] [ INNER ] JOIN table-ref | table-ref [ INNER ] JOIN table-ref [ join-spec ] table-ref [ NATURAL ] [LEFT|RIGHT|FULL] OUTER JOIN table-ref | table-ref [LEFT|RIGHT|FULL] OUTER JOIN table-ref [ join-spec ] table-ref UNION JOIN table-ref table-ref CROSS JOIN table-ref ON search-condition | USING ( col-list )
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