Query to Find all the Tables and their corresponding columns,dataType in DB

Hi all,
I need a query which can give me all the Tables existing in my DB and their corresponding Columns existed for those tables and Datatype for each column .
Thanks in Advance,
viajy

Hi,
For your user tables you can use USER_TAB_COLUMNS.
Just give DESC USER_TAB_COLUMNS at your SQL> prompt.
You will know on that object.
Regards,
Sailaja

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Dear Micky Oestreich
May be we possess expertise or high level experience, it should not show up in our way of communication. Every professional starts with the basic stuff to learn. When the question is raised in such minimum polite way, the same level of courtesy is expected in return. If you felt my question was basic, you might have refused it gently. If you are in good mood or bad mood it doesn't matters.
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how to write a script to generate all the tables and objects in a schema.
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Dear Sidhant,
Try this script:
set termout off
set feedback off
set serveroutput on size 100000
spool ddl_schema.sql
begin
dbms_output.put_line('--');
dbms_output.put_line('-- DROP TABLES --');
dbms_output.put_line('--');
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    end loop;
end;
declare
    v_tname varchar2(30);
    v_cname char(32);
    v_type     char(20);
    v_null   varchar2(10);
    v_maxcol number;
    v_virg     varchar2(1);
begin
dbms_output.put_line('--');
dbms_output.put_line('-- CREATE TABLES --');
dbms_output.put_line('--');
    for rt in (select table_name from user_tables order by 1) loop
        v_tname:=rt.table_name;
        v_virg:=',';
        dbms_output.put_line('CREATE TABLE '||v_tname||' (');
        for rc in (select table_name,column_name,data_type,data_length,
                            data_precision,data_scale,nullable,column_id
                from user_tab_columns tc
                where tc.table_name=rt.table_name
                order by table_name,column_id) loop
                    v_cname:=rc.column_name;
                    if rc.data_type='VARCHAR2' then
                        v_type:='VARCHAR2('||rc.data_length||')';
                    elsif rc.data_type='NUMBER' and rc.data_precision is null and
                                         rc.data_scale=0 then
                        v_type:='INTEGER';
                    elsif rc.data_type='NUMBER' and rc.data_precision is null and
                                     rc.data_scale is null then
                        v_type:='NUMBER';
                    elsif rc.data_type='NUMBER' and rc.data_scale='0' then
                        v_type:='NUMBER('||rc.data_precision||')';
                    elsif rc.data_type='NUMBER' and rc.data_scale<>'0' then
                        v_type:='NUMBER('||rc.data_precision||','||rc.data_scale||')';
                    elsif rc.data_type='CHAR' then
                         v_type:='CHAR('||rc.data_length||')';
                    else v_type:=rc.data_type;
                    end if;
                    if rc.nullable='Y' then
                        v_null:='NULL';
                    else
                        v_null:='NOT NULL';
                    end if;
                    select max(column_id)
                        into v_maxcol
                        from user_tab_columns c
                        where c.table_name=rt.table_name;
                    if rc.column_id=v_maxcol then
                        v_virg:='';
                    end if;
                    dbms_output.put_line (v_cname||v_type||v_null||v_virg);
        end loop;
        dbms_output.put_line(');');
    end loop;
end;
declare
    v_virg        varchar2(1);
    v_maxcol    number;
begin
dbms_output.put_line('--');
dbms_output.put_line('-- PRIMARY KEYS --');
dbms_output.put_line('--');
    for rcn in (select table_name,constraint_name
            from user_constraints
            where constraint_type='P'
            order by table_name) loop
        dbms_output.put_line ('ALTER TABLE '||rcn.table_name||' ADD (');
        dbms_output.put_line ('CONSTRAINT '||rcn.constraint_name);
        dbms_output.put_line ('PRIMARY KEY (');
        v_virg:=',';
        for rcl in (select column_name,position
                from user_cons_columns cl
                where cl.constraint_name=rcn.constraint_name
                order by position) loop
            select max(position)
                into v_maxcol
                from user_cons_columns c
                where c.constraint_name=rcn.constraint_name;
            if rcl.position=v_maxcol then
                v_virg:='';
            end if;
            dbms_output.put_line (rcl.column_name||v_virg);
        end loop;
        dbms_output.put_line(')');
        dbms_output.put_line('USING INDEX );');
    end loop;
end;
declare
    v_virg        varchar2(1);
    v_maxcol    number;
    v_tname        varchar2(30);
begin
dbms_output.put_line('--');
dbms_output.put_line('-- FOREIGN KEYS --');
dbms_output.put_line('--');
    for rcn in (select table_name,constraint_name,r_constraint_name
            from user_constraints
            where constraint_type='R'
            order by table_name) loop
        dbms_output.put_line ('ALTER TABLE '||rcn.table_name||' ADD (');
        dbms_output.put_line ('CONSTRAINT '||rcn.constraint_name);
        dbms_output.put_line ('FOREIGN KEY (');
        v_virg:=',';
        for rcl in (select column_name,position
                from user_cons_columns cl
                where cl.constraint_name=rcn.constraint_name
                order by position) loop
            select max(position)
                into v_maxcol
                from user_cons_columns c
                where c.constraint_name=rcn.constraint_name;
            if rcl.position=v_maxcol then
                v_virg:='';
            end if;
            dbms_output.put_line (rcl.column_name||v_virg);
        end loop;
        select table_name
            into v_tname
            from user_constraints c
            where c.constraint_name=rcn.r_constraint_name;
        dbms_output.put_line(') REFERENCES '||v_tname||' (');
        select max(position)
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                from user_cons_columns c
                where c.constraint_name=rcn.r_constraint_name;
        v_virg:=',';
        select max(position)
            into v_maxcol
            from user_cons_columns c
            where c.constraint_name=rcn.r_constraint_name;
        for rcr in (select column_name,position
                from user_cons_columns cl
                where rcn.r_constraint_name=cl.constraint_name
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            if rcr.position=v_maxcol then
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            end if;
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    end loop;
end;
begin
dbms_output.put_line('--');
dbms_output.put_line('-- DROP SEQUENCES --');
dbms_output.put_line('--');
    for rs in (select sequence_name
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            order by sequence_name) loop
        dbms_output.put_line('DROP SEQUENCE '||rs.sequence_name||';');
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dbms_output.put_line('-- CREATE SEQUENCES --');
dbms_output.put_line('--');
    for rs in (select sequence_name
            from user_sequences
            where sequence_name like 'SQ%'
            order by sequence_name) loop
        dbms_output.put_line('CREATE SEQUENCE '||rs.sequence_name||' NOCYCLE;');
    end loop;
end;
declare
    v_virg        varchar2(1);
    v_maxcol    number;
begin
dbms_output.put_line('--');
dbms_output.put_line('-- INDEXES --');
dbms_output.put_line('--');
    for rid in (select index_name, table_name
            from user_indexes
            where index_name not in (select constraint_name from user_constraints)
                and index_type<>'LOB'
            order by index_name) loop
        v_virg:=',';
        dbms_output.put_line('CREATE INDEX '||rid.index_name||' ON '||rid.table_name||' (');
        for rcl in (select column_name,column_position
                from user_ind_columns cl
                where cl.index_name=rid.index_name
                order by column_position) loop
            select max(column_position)
                into v_maxcol
                from user_ind_columns c
                where c.index_name=rid.index_name;
            if rcl.column_position=v_maxcol then
                v_virg:='';
            end if;
            dbms_output.put_line (rcl.column_name||v_virg);
        end loop;
        dbms_output.put_line(');');
    end loop;
end;
spool off
set feedback on
set termout on Best Regards,
Francisco Munoz Alvarez
www.oraclenz.com

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