[database-name .] view-name
trigger-action
database-event ::=
DELETE |
INSERT |
UPDATE |
UPDATE OF column-list
trigger-action ::=
[ FOR EACH ROW | FOR EACH STATEMENT ] [ WHEN expression ]
BEGIN
trigger-step ; [ trigger-step ; ]*
END
trigger-step ::=
update-statement | insert-statement |
delete-statement | select-statement
例子：
CREATE TRIGGER update_customer_address UPDATE OF address ON customers
BEGIN
UPDATE orders SET address = new.address WHERE customer_name = old.name;
END;
说明：
创建了一个名为update_customer_address的触发器，当用户更新customers表中的address字段时，将触发并更新orders表中的address字段为新的值。
比如执行如下一条语句：
UPDATE customers SET address = ''''1 Main St.'''' WHERE name = ''''Jack Jones'''';
数据库将自动执行如下语句：
UPDATE orders SET address = ''''1 Main St.'''' WHERE customer_name = ''''Jack Jones'''';
CREATE INDEX
为给定表或视图创建索引。
语法：
sql-statement ::=
CREATE [UNIQUE] INDEX index-name
ON [database-name .] table-name ( column-name [, column-name]* )
[ ON CONFLICT conflict-algorithm ]
column-name ::=
name [ COLLATE collation-name] [ ASC | DESC ]
例子：
CREATE INDEX idx_email ON customers (email);
说明：
为customers表中的email创建一个名为idx_email的字段。
结构删除
DROP TABLE
删除表定义及该表的所有索引。
语法：
sql-command ::=
DROP TABLE [database-name.] table-name 例子：
DROP TABLE customers;
DROP VIEW
删除一个视图。
语法：
sql-command ::=
DROP VIEW view-name
例子：
DROP VIEW master_view;
DROP TRIGGER
删除一个触发器。
语法：
sql-statement ::=
DROP TRIGGER [database-name .] trigger-name
例子：
DROP TRIGGER update_customer_address;
DROP INDEX
删除一个索引。
语法：
sql-command ::=
DROP INDEX [database-name .] index-name
例子：
DROP INDEX idx_email;
数据操作
INSERT
将新行插入到表。
语法：
sql-statement ::=
INSERT [OR conflict-algorithm] INTO [database-name .] table-name [(column-list)] VALUES(value-list) |
INSERT [OR conflict-algorithm] INTO [database-name .] table-name [(column-list)] select-statement
UPDATE
更新表中的现有数据。
语法：
sql-statement ::=
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