0
votes
1answer
38 views

Select * from (every table in an subselect)

I was trying to get an select * from (for column table result) every table_name with the result bellow, how can i achieve this? (SELECT a.table_name FROM all_cons_columns a JOIN all_constraints c ...
0
votes
2answers
95 views

SQL insert into … values (…, select(…))

I am trying to insert 25 users, user1...25 into Members with the same GR_ID = 2 with command: insert into MEMBERS (GR_id, username) values (2, (select username from USERS where username like ...
0
votes
1answer
100 views

performance difference between < and <=

I remember that there is a performance issue with SQLs that use "<" against "<=" because of statistics and/or histograms and/or the data itself, but I dont remember exactly the issue. I know ...
0
votes
3answers
84 views

prepared statements are not inserted

i am new to JDBC and trying following code. Could not find the error in it try{ Connection con = ConnectionProvider.getCon(); stmt=con.prepareStatement("insert into ...
0
votes
0answers
81 views

How to grant privileges for a user to create views on specific tables on Oracle SQL?

I just added: GRANT CREATE VIEW TO user1; But it gives user1 access to ALL the tables, I would like them to only have access to the tables where the field X is user1
1
vote
2answers
4k views

Index for date column for range query in Oracle?

We have a lot: select count(*) from TBL where XDATE between ? and ? and FLD = ?; We expect to boost performance by tuning index on XDATE column (which have DATE type). What type of indexes more ...
3
votes
1answer
539 views

Index on foreign key makes query extremely slow

We are recently experiencing a tremendous query slowdown with spilled over temp tablespace. A specific query causes this problem. The queried table (table3) has an indexed PK, three FK with indexes ...
2
votes
1answer
317 views

Help with SELECT queries

I need help with some queries. I struggled do find out how to do it, but I think I finally caught on or at least got the results I was looking for in the database. These are the tables (given by my ...
0
votes
1answer
1k views

Select fields from multiple tables

I want to make a query a little complicated, and I'm not able to do it alone. I have the following tables: Table color: id_uo P id_cor PF id_area F text_cor Table area: id_area P ...
9
votes
3answers
2k views

Why do I have to select from the dual table?

This works in the major Relation Database Management Systems most likely to appear on StackOverflow/dba.stackexchange, being SQL Server, MySQL, PostgreSQL and SQLite (WebSQL). select 'abc' abc, 1 ...
2
votes
1answer
2k views

Oracle error “too many values”, must be solved with nested SELECTs

I have hit upon a "too many values" error in Oracle, when working with some intricate nested SELECTs. A simplified description of my problem, on a toy problem describing the hierarchy in a company. ...
2
votes
1answer
2k views

Simple Oracle query hangs depending on WHERE clause

Not used to using Oracle, but we have a large database where a non-unique query like SELECT * FROM employees where department = 'HR' is working, results list up no problem. But when I do ...
0
votes
3answers
470 views

Can a RDBMS connect to a remote server, execute a select query and copy them into a local table just with SQL commands?

I'm sorry it may sound stupid but I've been wondering about how multiple databases are automated before the virtualization era. Can a DB Adminsitrator make a stored procedure to get data from a remote ...
13
votes
2answers
59k views

oracle - list users with access to certain tables

I'm sure this has been asked before but I can't seem to find the relevant details for the following. Is there some sort of pre-built table that can do the following (I have used dba_tab_privs but it ...
7
votes
3answers
7k views

What does the term “projection” refer to in an SQL query (or view definition)

In Oracle's document The Query Optimizer, under View Merging, I found the following information The view merging optimization applies to views that contain only selections, projections, and ...
6
votes
4answers
2k views

Multiple operations using WITH

Is there a way to execute multiple operations using the WITH statement? Something like WITH T AS ( SELECT * FROM Tbl ) BEGIN OPEN P_OUTCURSOR FOR SELECT * FROM T; SELECT COUNT(*) INTO ...
0
votes
3answers
187 views

How can I select data and the total to cursors?

I have a table like this: ID | Name ------------ 1 | AA 2 | AA 3 | AA 4 | BB I want to select all rows where Name like 'AA' in a cursor and get the count from this result in another ...