一、分页写法小例：
select first 10 templateid,code,name from template ;
select first 10 skip 10 templateid,code,name from template ;
select * from shop rows 1 to 10;  --firebird2.0支持这种写法

二、show
　　show tables;
    show table tablename;
三、
  D:\firebird2\bin>isql -u sysdba -p masterkey
  connect "E:\company\xmwsoft\newxmwsoft\c2\db\cts2.fdb";
四、--更新字段注释
update RDB$RELATION_FIELDS
set RDB$DESCRIPTION = '描述信息'
where (RDB$RELATION_NAME = 'SHOP') and
(RDB$FIELD_NAME = 'CREDIT_BUY')

五、--显示字段注释
select RDB$FIELD_NAME,RDB$DESCRIPTION from RDB$RELATION_FIELDS
where (RDB$RELATION_NAME = 'SHOP')
and
(RDB$FIELD_NAME = 'CREDIT_BUY')

六、--更新表注释
update RDB$RELATIONS set RDB$DESCRIPTION = '描述信息' where RDB$RELATION_NAME='TABLE_NAME'

七、--查询所有的表和视图（包括系统表和系统视图）
SELECT RDB$RELATION_NAME FROM RDB$RELATIONS;

八、--查询所有的用户表和用户视图
SELECT RDB$RELATION_NAME FROM RDB$RELATIONS WHERE RDB$SYSTEM_FLAG = 0;

九、--查询所有的用户表
SELECT RDB$RELATION_NAME FROM RDB$RELATIONS WHERE RDB$SYSTEM_FLAG = 0 AND RDB$VIEW_BLR IS NULL

十、查所有用户表、用户视图所有字段及相关定义
  SELECT a.RDB$RELATION_NAME, b.RDB$FIELD_NAME, b.RDB$FIELD_ID, d.RDB$TYPE_NAME,
  c.RDB$FIELD_LENGTH, c.RDB$FIELD_SCALE
  FROM RDB$RELATIONS a
  INNER JOIN RDB$RELATION_FIELDS b
  ON a.RDB$RELATION_NAME = b.RDB$RELATION_NAME
  INNER JOIN RDB$FIELDS c
  ON b.RDB$FIELD_SOURCE = c.RDB$FIELD_NAME
  INNER JOIN RDB$TYPES d
  ON c.RDB$FIELD_TYPE = d.RDB$TYPE
  WHERE a.RDB$SYSTEM_FLAG = 0
  AND d.RDB$FIELD_NAME = 'RDB$FIELD_TYPE'
  ORDER BY a.RDB$RELATION_NAME, b.RDB$FIELD_ID
十一、查找某表的所有字段及相关定义
  SELECT A.RDB$FIELD_NAME, B.RDB$FIELD_TYPE, B.RDB$FIELD_LENGTH, B.RDB$FIELD_PRECISION, B.RDB$FIELD_SCALE
  FROM RDB$RELATION_FIELDS A, RDB$FIELDS B
  WHERE A.RDB$RELATION_NAME = 'tablename'
  AND A.RDB$FIELD_SOURCE = B.RDB$FIELD_NAME
  ORDER BY A.RDB$FIELD_POSITION
十二、查找某表的主键定义字段
  select A.RDB$FIELD_NAME FROM RDB$INDEX_SEGMENTS A, RDB$RELATION_CONSTRAINTS B
  WHERE B.RDB$CONSTRAINT_TYPE = 'PRIMARY KEY'
  AND B.RDB$RELATION_NAME = 'tablename'
  AND A.RDB$INDEX_NAME = B.RDB$INDEX_NAME
  ORDER BY A.RDB$FIELD_POSITION
十三、查找某表的外键定义  
  select r1.RDB$CONSTRAINT_NAME, rind.RDB$FIELD_NAME, r2.RDB$RELATION_NAME
  FROM RDB$RELATION_CONSTRAINTS r1, RDB$RELATION_CONSTRAINTS r2, RDB$REF_CONSTRAINTS ref, RDB$INDEX_SEGMENTS rind
  where r1.RDB$RELATION_NAME = 'tablename'
  and r1.RDB$CONSTRAINT_TYPE = 'FOREIGN KEY'
  and r1.RDB$CONSTRAINT_NAME = ref.RDB$CONSTRAINT_NAME
  and ref.RDB$CONST_NAME_UQ = r2.RDB$CONSTRAINT_NAME
  and r1.RDB$INDEX_NAME = rind.RDB$INDEX_NAME

（出处：http://www.3asoft.com/article/11535.html）