I have a PL/SQL block where I am trying to get the count of filled and not filled values for each column of a table i.e. "demo_table".
select count(*) into v_count from demo_table
where owner='OWNER_1' and(rec.COLUMN_NAME is null OR
REGEXP_LIKE(rec.COLUMN_NAME,'^-$') OR REGEXP_LIKE (rec.COLUMN_NAME,'^-$'));
I am displaying the v_count through dbms_output. But I am not able to get the count.
This is what I am doing:
declare
CURSOR C1 IS
SELECT COLUMN_NAME FROM ALL_TAB_COLUMNS
WHERE TABLE_NAME ='demo_table';
v_count number(10);
begin
for rec in c1 loop
dbms_output.put_line(rec.COLUMN_NAME);
select count(*) into v_count from demo_table
where owner='OWNER_1'
and(rec.COLUMN_NAME is null
OR REGEXP_LIKE(rec.COLUMN_NAME,'^-$')
OR REGEXP_LIKE (rec.COLUMN_NAME,'^-$'));
dbms_output.put_line(v_count);
end loop;
dbms_output.put_line(v_count);
end;
Related
I need to verify converted data, distinct values and records counts. I would like to write statements so that I can enter a table name, then retrieve it's columns and use them in a query to get its distinct values (the actual values, not just a count of how many distinct) and their count.
I think I need to a CURSOR or CURSOR FOR LOOP and create something like this:
declare
cursor field_name
is
select COLUMN_NAME
from user_tab_cols
where table_name='TABLE1'
c_field_name field_name%ROWTYPE;
BEGIN
OPEN field_name
loop
fetch field_name INTO c_field_name;
exit when field_name%NOTFOUND;
end loop;
CLOSE field_name;
end;
Then run a query using that above in something like
select field_name, count(*)
from table1
group by field_name
Do I need to create 2 loop statements? I've not yet created one and can't quite get the context to get my results so far.
BEGIN
FOR myrow in (select field_name, count(*) as "count" from table1 group by field_name)
loop
dbms_output.put_line(myrow.field_name);
dbms_output.put_line(myrow.count);
end loop;
end;
Considering you will be giving the table name as parameter below code will print all the values of all the columns one by one along with the count of the values
create or replace PROCEDURE PR_PREP(
P_TABLE_NAME IN VARCHAR2)
IS
CURSOR CUR_COLUMNS (PA_TABLE_NAME VARCHAR2)
IS
SELECT COLUMN_NAME FROM ALL_TAB_COLUMNS WHERE TABLE_NAME = PA_TABLE_NAME;
COL_NAMES CUR_COLUMNS%ROWTYPE;
TYPE TYP_RECORD
IS
RECORD
(
FIELD_NAME VARCHAR2(255),
CNT INT);
TYPE TYP_OP_TABLE
IS
TABLE OF TYP_RECORD;
OP_TABLE TYP_OP_TABLE;
I INT;
V_SQL VARCHAR2(2000);
BEGIN
FOR COL_NAMES IN CUR_COLUMNS(P_TABLE_NAME)
LOOP
V_SQL := 'SELECT ' || COL_NAMES.COLUMN_NAME || ' AS FIELD_NAME ,
COUNT(*) AS CNT FROM ' ||
P_TABLE_NAME || ' GROUP BY ' || COL_NAMES.COLUMN_NAME ;
-- DBMS_OUTPUT.PUT_LINE (V_SQL);
EXECUTE IMMEDIATE V_SQL BULK COLLECT INTO OP_TABLE;
dbms_output.put_line('columna name = ' ||COL_NAMES.COLUMN_NAME);
FOR I IN OP_TABLE.FIRST .. OP_TABLE.LAST
LOOP
DBMS_OUTPUT.PUT_LINE('FIELD VALUE '||OP_TABLE(I).FIELD_NAME || ' COUNT = ' || OP_TABLE(I).CNT);
END LOOP;
DBMS_OUTPUT.PUT_LINE('ONE FILED ENDED , NEXT STARTED');
END LOOP;
END;
I have table with 100 columns with not correlated names (ABC1, DA23, EE123 - there is no common pattern there).
I want to iterate through every row and every column in this table.
My current script:
BEGIN
FOR single_row IN (
SELECT *
FROM MY_TABLE)
LOOP
--iterate through columns of 'single_row'
--for each nullable column do insert with real current column name and column value)
--I assume each column is nullable except of ID
INSERT INTO ANOTHER_TABLE VALUES (single_row.id, column_name, column_value);
END LOOP;
END;
So for example, if MY_TABLE contains 2 rows:
ID|ABC1|DA23|EE123|...
1|123|456|789|...
2|321|654|987|...
After running my script, my ANOTHER_TABLE will contain:
MY_TABLE_ID|COLUMN_NAME|COLUMN_VALUE
1|ABC1|123
1|DA23|456
1|EE123|789
... other columns from row 1
2|ABC1|321
2|DA23|654
2|EE123|987
... other columns from row 2
How I can do this?
I'm using Oracle 11g
EDIT
#vkp provided great solution, but there is one more thing to solve. I don't want to specify all columns in in clause. I would love to use some kind of query there or * or anything else, just to not be forced to list all of them.
I have tried something like this:
select *
from MY_TABLE t
unpivot (
column_value for column_name in (select column_name
from user_tab_columns
where table_name = 'MY_TABLE'
and nullable = 'Y')
) u
but it returns error:
ORA-00904: : invalid identifier
00904. 00000 - "%s: invalid identifier"
This is an application of unpivot.
select *
from my_table m
unpivot (column_value for column_name in (ABC1,DA23,EE123)) u
null values for any of the columns for an id won't be shown in the result.
If you have to include null values in the output, use the option INCLUDE NULLS.
select *
from my_table m
unpivot include nulls (column_value for column_name in (ABC1,DA23,EE123)) u
Edit: To include column names dynamically, use
DECLARE
sql_stmt VARCHAR2(4000);
var_columns VARCHAR2(4000); --use clob datatype if the column names can't fit in with this datatype
BEGIN
SELECT LISTAGG(column_name,',') WITHIN GROUP(ORDER BY column_name)
INTO var_columns
FROM user_tab_columns
WHERE table_name='MY_TABLE' AND column_name<>'ID';
sql_stmt:='select * from my_table m
unpivot
(column_value for column_name in (' || var_columns || ')) u';
EXECUTE IMMEDIATE sql_stmt;
END;
/
First option. With dynamic sql.
declare
v_ctx number;
v_query varchar2(500);
v_total NUMBER;
v_desctab DBMS_SQL.DESC_TAB;
v_column_cnt NUMBER;
v_value varchar2(32767);
v_result clob := '';
v_rownum number := 0;
begin
v_ctx := dbms_sql.open_cursor;
v_query := 'select * from user_objects where rownum < 100';
dbms_sql.parse(v_ctx,v_query,dbms_sql.v7);
v_total := dbms_sql.execute(v_ctx);
DBMS_SQL.DESCRIBE_COLUMNS(v_ctx, v_column_cnt, v_desctab);
for i in 1 .. v_column_cnt loop
dbms_sql.define_column(v_ctx, i, v_value /* data_type varchar2*/, 32767 /* max_length*/);
end loop;
loop
exit when dbms_sql.fetch_rows(v_ctx) = 0;
v_rownum := v_rownum +1;
for i in 1 .. v_column_cnt loop
dbms_sql.column_value(v_ctx, i, v_value);
dbms_output.put_line(v_rownum||' - '||v_desctab(i).col_name||' - '||v_value);
end loop;
end loop;
dbms_sql.close_cursor(v_ctx);
exception
when others then
dbms_sql.close_cursor(v_ctx);
raise;
end;
/
2nd option with xquery.
select t1.id,t2.* from xmltable('for $i in ora:view("<you_table_here>")/ROW
return $i'
columns id FOR ORDINALITY
, row_value xmltype path'.'
) t1
,xmltable('for $i in $row_value/ROW/* return $i'
passing t1.row_value as "row_value"
columns col_index for ORDINALITY ,
column_name varchar2(100) path 'name()',
column_value varchar2(100) path 'text()'
) t2
Here is a simple solution using REF CURSOR.
I've tried this code and it's working at my end.
DECLARE
query_2 VARCHAR2(1000);
TYPE icur IS REF CURSOR;
ic icur;
col_val VARCHAR2(100);
BEGIN
FOR j IN
(SELECT * FROM user_tab_cols WHERE table_name = UPPER('MY_TABLE'))
LOOP
dbms_output.put_line(j.column_name);
query_2 := 'SELECT ' || j.column_name|| ' FROM MY_TABLE';
OPEN ic FOR query_2;
LOOP
FETCH ic INTO col_val;
EXIT WHEN ic%NOTFOUND;
INSERT INTO ANOTHER_TABLE VALUES( j.column_name, col_val);
END LOOP;
END LOOP;
END;
/
DECLARE
tablename table;
nor number(10);
BEGIN
tablename:=&tablename;
select count(*) into nor from tablename;
dbms_output.put_line('The number of rows are '||nor);
END;
/
I am using this code to take table name as input from user and displaying the row count but it shows errors but if use a specific table name it runs fine!
DECLARE
tablename table;
nor number(10);
BEGIN
tablename:=&tablename;
execute immediate 'select count(*) from '|| tablename
into nor;
dbms_output.put_line('The number of rows are '||nor);
END;
/
You can try to use EXECUTE IMMDEDIATE
Is there a way to store a query in an object so that you can use it in a cursor or as a subquery of a bigger query? all this without using execute immediate?
Lets supose you want this:
set serveroutput on;
DECLARE
CNT NUMBER;
v1 varchar2(4000);
SQL_QUERY view := SELECT table_name FROM USER_TABLES;
CURSOR C1 IS
SQL_QUERY;
BEGIN
OPEN C1;
FETCH C1 INTO V1;
dbms_output.put_line('name of the first table: '||v1);
CLOSE C1;
SELECT COUNT(*) INTO CNT FROM SQL_QUERY;
dbms_output.put_line('Count: '|| cnt);
end;
Is it possible?
"store a query in an object"
which is the definition of a view.
create view foo as select table_name from user_tables;
then
DECLARE
CNT NUMBER;
v1 varchar2(4000);
CURSOR C1 IS
select * from foo;
BEGIN
OPEN C1;
FETCH C1 INTO V1;
dbms_output.put_line('name of the first table: '||v1);
CLOSE C1;
SELECT COUNT(*) INTO CNT FROM (select null from foo);
dbms_output.put_line('Count: '|| cnt);
end;
isn't that what you want?
I have a procedure that will select MAX from some tables, but for some reason it is not able to find these tables. Could anybody help me?
declare
varible1 varchar2 (255);
temp varchar2 (255);
last_val number(9,0);
cursor c1 is Select distinct table_name from user_tab_cols order by table_name;
begin
FOR asd in c1
LOOP
temp := asd.table_name;
varible1 := '"'||temp||'"';
select max("id") into last_val from varible1 ;
END LOOP;
end;
For example, the first table name is acceptance_form and for select I need to use "acceptance_form".
Code after edit:
declare
varible1 varchar2 (255);
temp varchar2 (255);
last_val number(9,0);
cursor c1 is Select distinct table_name from user_tab_cols where column_name = 'id';
begin
FOR asd in c1
LOOP
temp := asd.table_name;
execute immediate 'select NVL(max('||'id'||'),0) from "'||varible1||'"' into last_val;
END LOOP;
end;
Can't cuz db is Case sensitive Oracle express 10g tables and rows was created like this
CREATE TABLE "ADMINMME"."acceptance_form"
(
"group_id" NUMBER(9, 0),
"id" NUMBER(4, 0) DEFAULT '0' NOT NULL ,
"is_deleted" NUMBER(4, 0),
"name" NVARCHAR2(30) NOT NULL
);
Can u tell me how to handle exception sequence dosn't exist for this;
Nevermind exception was in wrong block :)
declare
temp varchar2 (255);
last_val number(9,0);
cursor c1 is Select distinct table_name from user_tab_cols where column_name = 'id';
begin
FOR asd in c1
LOOP
temp := asd.table_name;
execute immediate 'select NVL(max("id"),0)+1 from "'||temp||'"' into last_val;
begin
EXECUTE IMMEDIATE 'drop sequence "seq_'|| temp||'"';
EXECUTE IMMEDIATE 'create SEQUENCE "seq_'|| temp ||'" MINVALUE '||last_val||'MAXVALUE 999999999999999999999999999 INCREMENT BY 1 NOCACHE';
EXECUTE IMMEDIATE 'select '||temp||'.nextval from dual';
EXECUTE IMMEDIATE 'ALTER SEQUENCE "seq_'||temp||'" INCREMENT BY 1';
exception when others then
null;
end;
END LOOP;
end;
Dynamic sql doesn't work in that way.
declare
varible1 varchar2 (255);
temp varchar2 (255);
last_val number(9,0);
cursor c1 is Select distinct table_name from user_tab_cols order by table_name;
begin
FOR asd in c1
LOOP
temp := asd.table_name;
begin
execute immediate 'select max(id) from '||temp into last_val;
dbms_output.put_line('max(id) for table: ' ||temp||' = '||last_val);
exception when others then
dbms_output.put_line('Failed to get max(id) for table: ' ||temp);
end;
END LOOP;
end;
You can't use a variable for the table name.
What you can do is creating the complete sql statement as a string and use execute immediate
Here are some examples how to do that: http://docs.oracle.com/cd/B19306_01/appdev.102/b14261/dynamic.htm#CHDGJEGD