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create table t_client (id number(4) primary key,
pid number(4) not null,
name varchar2(30) not null,
client_id varchar2(10),
client_level char(3),
bank_acct_no varchar2(30),
contact_tel  varchar2(30),
address    varchar2(30),
zip_code varchar2(10),
is_leaf char(1) default 'y' check (is_leaf in('y','n')),
is_client char(1) default 'n' check (is_client in('y','n')
));

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ÅóÓÑÊÇÕâÑùµÄ  ÎÒÓиöÏòÊý¾Ý¿âÀïÃæ ²åÈëÊý¾ÝµÄ·½·¨ SQL Óï¾äÊÇÕâÑùдµÄ
String sql = "insert into t_client(pid, name, client_id, client_level, bank_acct_no, " +
"contact_tel, address, zip_code, is_leaf, is_client) " +
"values(?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
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create sequence seq_t
start with 1
increment by 1;

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String sql = "insert into t_client(pid, name, client_id, client_level, bank_acct_no, " +
"contact_tel, address, zip_code, is_leaf, is_client) " +
"values(seq_t.nextval, ?, ?,


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