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select  lower( column_name) ||','||'--'||comments
from user_col_comments    c
where c.table_name  = upper('acc_fundcap')
SELECT * from USER_TAB_COMMENTS WHERE TABLE_NAME='T_META';
INSERT INTO ±íÃû(×Ö¶ÎÃû1, ×Ö¶ÎÃû2) SELECT ×Ö¶ÎÃû1, ×Ö¶ÎÃû2 from ÁíÍâµÄ±íÃû;


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ÐÞ¸Ämax_allowed_packet,net_buffer_lengthµÈ¼¸¸ö²ÎÊý,»òÖ±½ÓSET GLOBAL varName=value.
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select t.*,i.index_type from user_ind_columns t,user_indexes i where t.index_name = i.index_name and t.table_name = i.table_name and t.table_name = Òª²éѯµÄ±í
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select cu.* from user_cons_columns cu, user_constr ......

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create or replace procedure output_date is
begin
dbms_output.put_line(sysdate);
end output_date;
/*´ø²ÎÊýinºÍoutµÄ´æ´¢¹ý³Ì*/
create or replace procedure get_username(v_id in number,v_username out varchar2)
as
begin
  select username into v_usern ......

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   create tablespace test_16k
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