I am trying to get count of all rows from views in oracle schema and my code is working fine. But when i try to add a condition like where actv_ind = 'Y', i am unable to get it working. Any suggestions on how to modify the code to make it working?
SELECT view_name,
TO_NUMBER(extractvalue(xmltype(dbms_xmlgen.getxml('select count(*) cnt from '||owner||'.'||view_name||
'where'||view_name||'.'||'actv_ind= Y')),'/ROWSET/ROW/CNT')) as VIEW_CNT
FROM all_views
WHERE owner = 'ABC' AND view_name not in ('LINK$')
I am getting the error ACTV_IND : Invalid Identifier.
The error messages from DBMS_XMLGEN are not very helpful so you need to be very careful with the syntax of the SQL statement. Add a space before and after the where, and add quotation marks around the Y:
SELECT view_name,
TO_NUMBER(extractvalue(xmltype(dbms_xmlgen.getxml('select count(*) cnt from '||owner||'.'||view_name||
' where '||view_name||'.'||'actv_ind= ''Y''')),'/ROWSET/ROW/CNT')) as VIEW_CNT
FROM all_views
WHERE owner = 'ABC' AND view_name not in ('LINK$');
The query still assumes that every view contains the column ACTV_IND. If that is not true, you might want to base the query off of DBA_TAB_COLUMNS WHERE COLUMN_NAME = 'ACTV_IND'.
Here's a simple sample schema I used for testing:
create user abc identified by abc;
create or replace view abc.view1 as select 1 id, 'Y' actv_ind from dual;
create or replace view abc.view2 as select 2 id, 'N' actv_ind from dual;
Related
I'm using the following script pl/sql:
EXECUTE IMMEDIATE 'insert into TAB1(ID, CODE, TYPE, ORDRE)
select ''KEY'', ''KEY_LIB'', ''TYP_KEY'', 3 FROM dual
where not exists(
select ID,CODE,TYPE,ORDRE
FROM TAB1
where TYPE=''TYP_KEY''
AND CODE =''KEY_LIB''
)';
And I'm getting the following error :
00000 - "FROM keyword not found where expected
The error seems to be in the second line but I can't figure out what's wrong.
Can anyone help please ?
Type is a keyword in Oracle. So, try with tablename.Type when type is a column name. Here is your revised query:
EXECUTE IMMEDIATE 'insert into TAB1(ID, CODE, TYPE, ORDRE)
select ''KEY'', ''KEY_LIB'', ''TYP_KEY'', 3 FROM dual
where not exists(
select ID,CODE,TYPE,ORDRE
FROM TAB1
where TAB1.TYPE=''TYP_KEY''
AND CODE =''KEY_LIB''
)';
You should better try it like this:
EXECUTE IMMEDIATE 'insert into TAB1(ID, CODE, "TYPE", ORDRE)
select :KEY, :KEY_LIB, :TYP_KEY, 3 FROM dual
where not exists(
select ID,CODE,"TYPE",ORDRE
FROM TAB1
where "TYPE" = :TYP_KEY
AND CODE = :KEY_LIB
)'
USING 'KEY', 'KEY_LIB', 'TYP_KEY', 'TYP_KEY', 'KEY_LIB';
You can use Alternative Quoting Mechanism (''Q'') for String Literals, then you don't need double quotes. With this technique it is much easier to test queries manually (if it is needed). Btw, your query works fine.
BEGIN
EXECUTE IMMEDIATE
q'[INSERT INTO tab1(id, code, type, ordre)
SELECT 'KEY', 'KEY_LIB', 'TYP_KEY', 3
FROM dual
WHERE NOT EXISTS(
SELECT 1
FROM tab1
where tab1.type = 'TYP_KEY'
AND code = 'KEY_LIB'
)]';
END;
/
I must create an oracle procedure to display a list of persons (parlimentaries) with an index for tuples.
For now, I wrote this piece of code (I haven't implemented the index)
create or replace procedure parlamentarieslist as
begin
select
ssn,
name,
surname,
from
parlimentaries p,
mandate m
where
p.ssn = m.parlamentaries AND m.legislature= (select
max(legislature) "m"
from mandate);
end parlamentarieslist;
However, oracle give me these errors
Error(5,3): PL/SQL: SQL Statement ignored
Error(12,3): PL/SQL: ORA-00936: missing expression
Why?
As I mentioned before in the comment part, the problem is due to
the missing INTO clause
existing typo(comma) after surname column in the uppermost select list.
Mostly, Procedures are used to return one column or single row and in results of SELECT statements may be returned to the output parameters by INTO clause. But, If you want to return list of persons (multi-rows), the following style may be more suitable :
SQL> set serveroutput on;
SQL> create or replace procedure parlamentarieslist as
begin
for c in
(
select p.ssn, p.name, p.surname,
max(m.legislature) over (partition by p.ssn ) m
from parlimentaries p inner join mandate m
on ( p.ssn = m.parlamentaries )
order by m.legislature desc
)
loop
dbms_output.put_line(' SSN : '||c.ssn||' Name : '||c.name||' Surname : '||c.surname);
end loop;
end parlamentarieslist;
/
SQL> exec parlamentarieslist;
Where Use a SQL of explict ANSI JOIN style, instead of old-fashioned comma seperated JOIN style.
I am just wondering if use = sign operator with sub-query instead of IN
Is it correct way ? and meet the oracle standard ?
Example
select column_name from my_table_1 where id = (select max(id) from my_table_2);
The Difference is related to the number of rows returned. If you have only one row returned from nested sql you may prefer both = or in operators. But if multiple rows returned from nested query, use in operator.
So, in your sql example you may prefer using any of the operators. Since, max functions returns only one row.
As you are fetching maximum value from subquery to compare with id, Both(= and IN )will work fine. But If you are trying to fetch more than one row then you have to use IN keyword.
If you have 1 result in sub query you are fine with using = sign, except when data type is wrong, for example , checking with same data type of dummy VARCHAR2(1)
select * from dual where 'X' = (select max(dual.dummy) from dual);
Is similar to using in (also same explain plain)
select * from dual where 'X' in (select max(dual.dummy) from dual);
But checking with different/wrong data type will result with exception ORA-01722 Invalid number
select * from dual where 1 =(select max(dual.dummy) from dual);
How do I return data out of IF statements? I have a IF statement which is meant to return a different result dependent of the result of that statement.
IF :Value = 1 THEN
SELECT Name FROM TABLE_A
ELSEIF :Value = 2 THEN
SELECT Name FROM TABLE_B
ELSEIF :Value = 3 THEN
SELECT Name FROM TABLE_C
but this doesn't work. It expects an INTO statement in those selects. I suspect this is because Oracle can't return out of a block?
Is there a quicker way to return those select statements without creating table variables to store the data or messing around with functions?
You can do this by plain SQL:
SELECT
':Value' user_input,
CASE
WHEN ':Value' IN('a1','a2','a3')
THEN (select name from table_a)
WHEN ':Value' = 'i'
THEN (select name from table_b)
END AS output
FROM
dual
(good info about case)
If you want more than one result in your cases, then you may opt to an intelligent UNION:
SELECT t1_Col_1, t1_Col_2,'&VALUE' from TABLE_1
WHERE '&VALUE' = '1'
UNION ALL
SELECT t2_Col_1, t2_Col_2,'&VALUE' from TABLE_2
WHERE '&VALUE' = '2'
In this solution, types and number of tx_Coln must be the same.
I have used this query to fetch the list of sequences belonging to an Oracle database user:
SELECT * FROM all_sequences x,all_tables B
WHERE x.sequence_owner=B.owner AND B.TABLE_NAME='my_table';
But that database user is having many more sequence also, so the query returns me all the sequence of the database user. Can anybody help me to find the particular sequence of my_table using query so that I can get the auto increment id in my application.
i want the query which fetch list of table of my database user with the sequence and triggers used in the table
You can get the triggers associated with your tables from the user_triggers view. You can then look for any dependencies recorded for those triggers in user_dependencies, which may include objects other than sequences (packages etc.), so joining those dependencies to the user_sequences view will only show you the ones you are interested in.
Something like this, assuming you are looking at your own schema, and you're only interesting in triggers that references sequences (which aren't necessarily doing 'auto increment', but are likely to be):
select tabs.table_name,
trigs.trigger_name,
seqs.sequence_name
from user_tables tabs
join user_triggers trigs
on trigs.table_name = tabs.table_name
join user_dependencies deps
on deps.name = trigs.trigger_name
join user_sequences seqs
on seqs.sequence_name = deps.referenced_name;
SQL Fiddle demo.
If you're actually looking at a different schema then you'll need to use all_tables etc. and filter and join on the owner column for the user you're looking for. And if you want to include tables which don't have triggers, or triggers which don't refer to sequences, you can use outer joins.
Version looking for a different schema, though this assumes you have the privs necessary to access the data dictionary information - that the tables etc. are visible to you, which they may not be:
select tabs.table_name,
trigs.trigger_name,
seqs.sequence_name
from all_tables tabs
join all_triggers trigs
on trigs.table_owner = tabs.owner
and trigs.table_name = tabs.table_name
join all_dependencies deps
on deps.owner = trigs.owner
and deps.name = trigs.trigger_name
join all_sequences seqs
on seqs.sequence_owner = deps.referenced_owner
and seqs.sequence_name = deps.referenced_name
where tabs.owner = '<owner>';
If that can't see them then you might need to look at the DBA views, again if you have sufficient privs:
select tabs.table_name,
trigs.trigger_name,
seqs.sequence_name
from dba_tables tabs
join dba_triggers trigs
on trigs.table_owner = tabs.owner
and trigs.table_name = tabs.table_name
join dba_dependencies deps
on deps.owner = trigs.owner
and deps.name = trigs.trigger_name
join dba_sequences seqs
on seqs.sequence_owner = deps.referenced_owner
and seqs.sequence_name = deps.referenced_name
where tabs.owner = '<owner>';
One way would be to run these queries to check if there are any sequence's Pseudocolumns (NEXTVAL and CURRVAL ) used in your functions , procedures, packages, Triggers or PL/SQL JAVA SOURCE.
select * from user_source where
UPPER(TEXT) LIKE '%NEXTVAL%';
select * from all_source where
UPPER(TEXT) LIKE '%NEXTVAL%';
Then go to the specific Procedure, Function or Trigger to check which column/table gets populated by a sequence.
The query could also be used with '%CURRVAL%'
This might not help if you are running inserts from JDBC or other external applications using a sequence.
Oracle 12c introduced the IDENTITY columns, using which you could create a table with an identity column, which is generated by default.
CREATE TABLE t1 (c1 NUMBER GENERATED BY DEFAULT ON NULL AS IDENTITY,
c2 VARCHAR2(10));
This will internally create a sequence that auto-generates the value for the table's column.So, If you would like to know which sequence generates the value for which table, you may query the all_tab_columns
SELECT data_default AS sequence_val
,table_name
,column_name
FROM all_tab_columns
WHERE OWNER = 'HR'
AND identity_column = 'YES';
SEQUENCE_VAL |TABLE_NAME |COLUMN_NAME
-----------------------------------------|-------------------------------------
"HR"."ISEQ$$_78160".nextval |T1 |C1
I found a solution to this problem to guess the sequence of a particular sequence
select * from SYS.ALL_SEQUENCES where SEQUENCE_OWNER='OWNER_NAME' and LAST_NUMBER between (select max(FIELD_NAME) from TABLE_NAME) and (select max(FIELD_NAME)+40 from TABLE_NAME);
This query will guess by search the LAST_NUMBER of the sequence value between MAX value of the field using sequence and Max value + 40 (in my case cache value is 20, so I put 40)
select SEQUENCE_NAME from sys.ALL_TAB_IDENTITY_COLS where owner = 'SCHEMA_NAME' and table_name = 'TABLE_NAME';