一、分页：
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、显示表名和表结构
SHOW TABLES;
SHOW TABLE tablename;
三、使用ISQL连接数据库
firebird%92bin>isql -u sysdba -p masterkey
SQL>CONNECT 'E:companyxmwsoftnewxmwsoftc2dbcts2.fdb';
或
SQL>CONNECT 'E:%92'
CON>USER 'sysdba'
CONT>PASSWORD 'masterkey';
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 (DB$FIELD_NAME = 'CREDIT_BUY')
六、更新表注释
UPDATE RDB$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;