Is there a way to count how many rows inserted into table by
Create table tbl1 as select * from tbl2;
statement which performed from PL\SQL function (execute immediate)?
When I'm using SQL%ROWCOUNT the result is 1.
Thanks.
You can try this. As mentioned in my comment you need to do it as followed. Remember that you need again to use Execute immediate else you get an issue that tab1 is undefined.
DECLARE
vsql VARCHAR2 (200);
cnt NUMBER;
BEGIN
vsql := 'create table tbl1 as select * from employee';
EXECUTE IMMEDIATE vsql;
vsql := 'select count(1) from tbl1';
EXECUTE IMMEDIATE vsql INTO cnt;
DBMS_OUTPUT.put_line (cnt);
END;
You can do one thing. You can first create an empty table tbl1 from tbl2. Then insert data using SELECT and then use- SQL%ROWCOUNT.
CREATE TABLE tbl1 AS SELECT * FROM tbl2 WHERE 1=2;
INSERT INTO tbl1 SELECT * FROM tbl2;
DBMS_OUTPUT.PUT_LINE ('No. of rows inserted in TBL2 from TBL1 = ' || SQL%ROWCOUNT);
Related
I have created a package and defined a procedure to delete specific rows retrieved by the cursor.
Before the rows were deleted from the table, I want to take a backup of those records every time the package is compiled and I need the backup table to be created as tablename concatenated with sysdate.
ex: if table name is emp, backup table should be created as emp_2020_10_16
Below is the sample code I have created:
PROCEDURE DELETE_REC(
P_retcode NUMBER,
P_errorbuff VARCHAR2,
P_unit_id NUMBER,
P_join_date VARCHAR2
)
IS
CURSOR cur1
IS
SELECT unit_ID,dept_ID,join_DATE
FROM EMP MMT
WHERE MMT.dep_TYPE_ID IN (44,35)
AND MMT.unit_id = P_unit_id
AND MMT.join_date < to_date(P_join_date,'RRRR/MM/DD HH24:MI:SS');
BEGIN
--begin
-- EXECUTE IMMEDIATE 'Create table EMP_' || to_char(sysdate,'yyyy_mm_dd') || ' as select * from EMP MMT WHERE MMT.dep_TYPE_ID IN (44,35)
AND MMT.unit_id = P_unit_id
AND MMT.join_date < to_date(P_join_date,'RRRR/MM/DD HH24:MI:SS');
--
-- end;
/*Here i would like to create backup table like above before executing the below delete statement but i am not sure about the correct standards that i should be using for above dynamic statement*/
FOR val IN cur1
LOOP
DELETE
FROM EMP MMT
WHERE MMT.dept_ID= val.dept_id;
How can I backup the table using above dynamic statement in best possible way? I am still learning PL&SQL.
Maybe sth like this would help:
create table employees as select * from hr.employees;
--drop table emp_2020_10_18;
--drop table employees;
----------------
declare
vTabName varchar2(50);
nDept_id number := 10;
nCnt number := 0;
vSQL varchar2(1000);
begin
vTabName := 'emp_'||to_char(sysdate, 'yyyy_mm_dd');
-- check if table exists
begin
execute immediate 'select count(*) from emp_tmp' into nCnt;
exception when others then
nCnt := -1;
end;
-- if not exists create one
if nCnt = -1 then
execute immediate 'create table '|| vTabName||' as select * from employees where 1=2' ;
end if;
execute immediate 'insert into '|| vTabName ||' select * from employees where department_id = :nDept_id' using nDept_id;
delete from employees where department_id = nDept_id;
exception when others then
dbms_output.put_line(sqlerrm);
end;
/
I want Stored Procedure which create Temporary table using Create Table ... Select ... Statement.
And then select the records from same created table.
And finally drop that created table...
I want all these functionality in same stored procedure.
I have create the following stored procedure. But i got the below error
PL/SQL: ORA-00942: table or view does not exist
This one is my Procedure
DECLARE
TEMP_TBL VARCHAR2(4000);
TBL_NAME VARCHAR2(200) := 'ABC_TEST';
BEGIN
TEMP_TBL := 'CREATE TABLE MY_TAB_COL AS(SELECT TABLE_NAME,COLUMN_NAME,DATA_TYPE,to_lob(DATA_DEFAULT) AS DATA_DEFAULT,NULLABLE FROM ALL_TAB_COLS WHERE TABLE_NAME=''' || TBL_NAME || ''')';
DBMS_OUTPUT.PUT_LINE(TEMP_TBL);
EXECUTE IMMEDIATE TEMP_TBL;
FOR DD_COLUMNS IN
(SELECT TABLE_NAME FROM MY_TAB_COL)
LOOP
DBMS_OUTPUT.PUT_LINE('DD_COLUMNS.TABLE_NAME');
END LOOP;
END;
I'm not sure why you want scenario like that, and not reccomend to use this code in production. I'm pretty sure in the 99% of the cases, this approach can be written in other way. But you can try the code bellow(Everything in your procedure should use dynamic sql)
declare
TBL_NAME varchar2(200) := 'ABC_TEST';
lv_Sql varchar2(4000);
begin
lv_Sql := 'CREATE TABLE MY_TAB_COL AS(SELECT TABLE_NAME,COLUMN_NAME,DATA_TYPE,to_lob(DATA_DEFAULT) AS DATA_DEFAULT,NULLABLE FROM ALL_TAB_COLS WHERE TABLE_NAME=''' ||
TBL_NAME || ''')';
DBMS_OUTPUT.PUT_LINE(lv_Sql);
execute immediate lv_Sql;
lv_Sql := 'begin
for DD_COLUMNS in (select TABLE_NAME from MY_TAB_COL) loop
DBMS_OUTPUT.PUT_LINE(DD_COLUMNS.TABLE_NAME);
end loop;
end;';
DBMS_OUTPUT.PUT_LINE(lv_Sql);
execute immediate lv_Sql;
for R in (select *
from user_objects
where object_name = 'MY_TAB_COL'
and object_type = 'TABLE') loop
DBMS_OUTPUT.PUT_LINE('drop table ' || R.Object_Name);
execute immediate 'drop table ' || R.Object_Name;
end loop;
end;
I need to create a table if it does not exist, and when it is created add a single row to it.
I'm new to oracle and PL/SQL so I basically need an equivalent of the following T-SQL:
IF OBJECT_ID('my_table', 'U') IS NULL
BEGIN
CREATE TABLE my_table(id numeric(38,0), date datetime)
INSERT INTO my_table
VALUES (NULL, 0)
END
if you want to check table creation
DECLARE count NUMBER;
BEGIN
count := 0;
SELECT COUNT(1) INTO count from user_tables WHERE table_name= 'MY_TABLE';
IF COL_COUNT = 0 THEN
EXECUTE IMMEDIATE 'create table ....';
END IF;
END;
/
A checking for DML .please note you have to sepcify your pk columns and values.
DECLARE count NUMBER;
BEGIN
count := 0;
SELECT COUNT(1) INTO count from MY_TABLE WHERE id= 0 and name='Something';
IF COL_COUNT = 0 THEN
EXECUTE IMMEDIATE 'insert into MY_TABLE (id,name) values(0,''something'') ';
END IF;
END;
/
also note I recomand to specify columns when you insert into a table
Another approach is to use exception logic. I changed field names and types according to Oracle rules
declare
eAlreadyExists exception;
pragma exception_init(eAlreadyExists, -00955);
begin
execute immediate 'CREATE TABLE my_table(id number, dateof date)';
execute immediate 'INSERT INTO my_table VALUES (NULL, sysdate)';
exception when eAlreadyExists then
null;
end;
but may be it is not a good idea to create tables dynamically
In my opinion, you should not be creating objects on the fly. You should think about your design before implementing it.
Anyway, if you really want to do it this way, then you need to do it programmatically in PL/SQL (ab)using EXECUTE IMMEDIATE.
However, I would prefer the CTAS i.e. create table as select if you want to create a table ta once with a single row. For example,
SQL> CREATE TABLE t AS SELECT 1 id, SYSDATE dt FROM DUAL;
Table created.
SQL> SELECT * FROM t;
ID DT
---------- ---------
1 29-MAY-15
SQL>
The table is created permanently.
If you are looking for a temporary table, which you could use to store session specific data , then look at creating Global temporary table.
From documentation,
Use the CREATE GLOBAL TEMPORARY TABLE statement to create a temporary
table. The ON COMMIT clause indicates if the data in the table is
transaction-specific (the default) or session-specific
You can use NOT EXISTS with select statement:
IF NOT EXISTS(SELECT 1 FROM my_table) THEN
CREATE TABLE my_table(id NUMBER, date date);
COMMIT;
INSERT INTO my_table(id, date) values (NULL, O);
COMMIT;
END IF;
UPDATE
According to the comment, I cannot use Exist directly in PL/SQL. So this is another way to do it:
begin
select case
when exists(select 1
from my_table)
then 1
else 0
end into l_exists
from dual;
if (l_exists = 1)
then
-- anything
else
EXECUTE IMMEDIATE 'CREATE TABLE my_table(id NUMBER, date date)';
EXECUTE IMMEDIATE 'INSERT INTO my_table(id, date) values (NULL, O)';
end if;
end;
I want to insert multiple rows into a table.
The query would be:
insert into temp(table_name,run_date,table_count)
select 'TABLE_A',sysdate,count(*) from A;
insert into temp(table_name,run_date,table_count)
select 'TABLE_B',sysdate,count(*) from B;
insert into temp(table_name,run_date,table_count)
select 'TABLE_C',sysdate,count(*) from C;
How do I write this in a loop using pl/sql?
Thanks,
Anju
For a variable list of tables, here's a script that reads the Oracle system table ALL_TABLES for a specified owner and inserts the counts into a temp table.
DECLARE
-- Define a cursor to get the list of tables you want counts for.
cursor c1 is
select table_name
from all_tables
where owner = 'YOUR_OWNER_HERE';
-- Dynamically created select.
stmt varchar2(200);
BEGIN
-- The cursor for loop implicitly opens and closes the cursor.
for table_rec in c1
loop
-- dynamically build the insert statement.
stmt := 'insert into temp(table_name,run_date,table_count) ';
stmt := stmt || 'select ''' || table_rec.table_name || ''','''|| sysdate||''','|| 'count(*) from ' || table_rec.table_name;
-- Execute the insert statement.
execute immediate(stmt);
end loop;
END;
commit;
I have a mapping table with source and table name as attributes.
And i have the below query :
select *
from
(select table_name from mapping_table where source='CL Table')
I want to retrieve the data of the table_name but this query will return only the table name not the data.
How to do it?
DECLARE
v_mystring VARCHAR(50);
v_my_ref_cursor sys_refcursor;
myrecord <some_table_or_type>;
BEGIN
select table_name into my_table_name
from mapping_table
where source='CL Table';
v_mystring := 'SELECT * from '||my_table_name;;
OPEN v_my_ref_cursor FOR v_mystring;
LOOP
FETCH v_my_ref_cursor INTO myrecord;
-- your processing
END LOOP;
CLOSE v_my_ref_cursor;
END;