DO NOT USE this for questions targeting Microsoft SQL Server, use the tag sql-server instead. "SQL" is an acronym for "Structured Query Language", it is used in relational database management systems (RDBMS) to query, update, delete, and insert data as well as modify the structure of the database. ...

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3answers
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Many-to-one Subselection in single query

I have two tables with a foreign key from T1->T2, in a one-to-many relationship. That is, 1 tuple in table T1 is associated with 0..N tuples in T2. To create a simple example, lets say T1 is Cars, ...
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2answers
492 views

How to isolate general Oracle 10g issues through SQL

Background: I've been working on a performance analysis on a system with major performance issues on a Oracle 10g server. Much of the SQL is badly written, or at least not written with performance in ...
3
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2answers
7k views

GROUP BY two columns

I want to count two columns, but need to get the results of first column in one row. SELECT country, COUNT(*) FROM table1 GROUP BY country, type This query gives me country type COUNT(*) ...
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0answers
84 views

Mysql: Large Query with subqueries optimization

Any query optimization gurus in the house?? Anyway, I am trying to attack this on two fronts, one being to code a way around it but secondly, I'm thinking some real optimization might help in the ...
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2answers
439 views

Mysql: Large Query with subqueries optimization

Any query optimization gurus in the house?? Anyway, I trying to attach this on two fronts, one I'm trying to code a way around it but secondly, I'm thinking some real optimization might help in the ...
0
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2answers
89 views

what is the best choice from those two tables?

what is the best choice from those tables?? table A : keep DB simple with lower number of tables ... but i will find difficulties if i wanted to extract certain data from column of doses coz it's ...
0
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1answer
681 views

Is there a way to list all tables and when they were last accessed?

I'm wondering if there's a way in SQL Server to make a list of all tables and when they were last accessed (select / update / insert or delete) either by a user, view or stored procedure?
4
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1answer
653 views

Query to check where database growth was?

I have a database that grew very significantly overnight and I'd like to find out why. I've restored yesterdays backup to another location. Is there a query I can run to query the size of tables or ...
8
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2answers
15k views

SQL Server backup failing. Error: 3041, Severity: 16, State: 1

First of all, I'm very new at stackexchange, so please bear with me. I'm running a SQL Server 9.0.4060. My problem is: my SQL Server backup keeps failing on a lot of the databases. The Maintenance ...
2
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1answer
1k views

MySQL - Create a function from another function

I want to create a function same like my old functions. When I create a table, I can use `AS to other table as follows: CREATE TABLE dummy2 AS SELECT * FROM dummy1; Can I do the same thing with ...
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1answer
138 views

a question in tables relations

Table A is linked to Table B , and Table B is linked to Table C using primary and foreign keys My questions: Should i link Table A to Table C too?? Or Table B can act as intermediate link between ...
3
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1answer
129 views

Help to create indexes to improve query performance and reduce report generation time

The database in SQL Server 2008 has these tables below - the main table being the Master: Master A_ID (PK) SYSSerialNumber Bootlog SequenceNumber FileName Cfg Unique(serialnumber,sequencenumber) ...
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2answers
330 views

Optimizing SSIS Packages

I have a SSIS package that loads data in an Access DB to tables on a SQL Server DB. Currently I double click the package and execute it. There are times when there is a lot of data to load. My ...
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1answer
2k views

Which is the shortest way to find out if a float IS NULL or equals 0 in mysql [closed]

I want to type the least possible characters, to find out all columns in a table that are 0 or NULL In this example I explain it further: lets assume the table test CREATE TABLE IF NOT EXISTS ...
13
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2answers
5k views

Performance Tuning for Huge Table (SQL Server 2008 R2)

Background: I have a fact table in UAT Phase. Objective to load 5 yrs of data in Prod (expected size 400 Mn records). Currently it has only 2 years of data in Test. Table Features: No of ...
0
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1answer
140 views

MySQL query optimization

I'm quite new to big MySQL queries (I used to extract raw data from tables then manipulate them with PHP) so I'd like to know if my query below is too "heavy" or slow for some reason (it seems to be ...
0
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1answer
581 views

Average, between specific date/time, of the difference between current field and previous field

Im trying to calc the average, between a specific date/time, of the difference between the current field and the previous field. At present ive got a query which displays this but im unsure how i can ...
0
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3answers
490 views

Pivoting row contents to produce one dimensional result

I have a table with a varchar column containing pipe-delimited values For example: Row 1 Column 1 = a|b|e|gg|foo Row 2 Column 1 = oV|foo|do Row 3 Column 1 = boop How can I query this to return ...
0
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1answer
760 views

Massive update to Clob fields oracle 10g

I need to remove a string of characters from 2000+ clobs fields in oracle 10g. How would I do this in PL/SQL? For example, in table t1 there is a clob field called VBase that needs to have the ...
1
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1answer
660 views

How to create sql query results in columns from rows?

From the following tables: store(store_id, ...) {1 ..., 2 ...} two stores film(film_id, ...) inventory(inventory_id, film_id, store_id) rental(rental_id, rental_date, inventory_id, return_date, ...) ...
3
votes
2answers
18k views

Single sql query to select a record from parent table only if all it's records in child table has values

I've Table1 and Table2, Table1's PK is the FK of Table2. Now i need to perform a select from Table1 if and only if all the records in Table2 corresponding to a Table1 record has values (if any field ...
3
votes
1answer
8k views

Joining 3 tables using SQL Query?

I'm having problems joining three tables. It works well when I use the same query for joining two tables (after removing LEFT OUTER JOIN C ON B.No = C.No). However, it doesn't work when I use three ...
4
votes
1answer
461 views

SQL Server 2008 upgrade advisor tool

We upgraded to SQL Server 2008 from SQL Server 2000. But due to some legacy scripts/queries in our health care application, that run only in 2000, we had to run 2008 version on backwards compatibility ...
3
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1answer
9k views

Restore Backup Fails - File 'Db' cannot be restored to '{…}.mdf'. Use WITH MOVE to identify a valid location for the file

I am getting the following errors trying to do a restore using the restore command on a backup file I recieved from a customer. RESTORE DATABASE SFDB FROM DISK = N'C:\Backup\Backup.bak' Any ...
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1answer
83 views

want to optimize this query by removing two SELECT and two JOINS

SELECT t3.transaction_pci_details_id, t3.terminal_id, t3.transaction_no, t4.transaction_id, t3.transaction_type, t3.reversal_flag, t3.transmission_date_time, t4.retrivel_ref_no, t3.card_no, ...
1
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1answer
82 views

Slave as a master in PostgreSQL [closed]

I have set up a hot standby in PostgreSQL 9.0 on Windows. I want that, at the time of fail-over, the slave should take over the role of master and start performing operations (both read and write) ...
1
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1answer
91 views

Tables of a huge database

When I work on a huge database, and after following normalization rules, I found that I have many tables for each part of my huge database. That makes me worry about the final number of tables, it ...
12
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2answers
550 views

SQL Server 2008 Performance issue with very strange resolution

I'm a long time DBA (12 years in SQL). I'm running SQL Server 2008 Enterprise in a Win 2008 clustered environment. 128gb memory and 32cpu in each cluster node. Not wimpy. I've got the weirdest ...
1
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1answer
66 views

Sanitizing a form's database input while retaining basic HTML markup

Is there a way to sanitize database input (say, for a comment form), which also allows for the end user to use basic HTML styling markup? As in, if a user wraps their text in <i>/<em> or ...
2
votes
1answer
367 views

UDF performance suddenly degraded

SQL Server 2008 R2 I know this is a common problem (eg: http://connect.microsoft.com/SQLServer/feedback/details/524983/user-defined-function-performance-is-unacceptable) - but ive only just learned ...
7
votes
2answers
2k views

PAGE compression in SQL Server effect on running queries

I am planning to apply PAGE compression to some of the big tables in my database (DW to be precise). These tables are fairly big with over 15 Billion rows. When I applied the compression in test ...
0
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2answers
2k views

Difference between chained and migrated rows

What is the difference between chained and migrated rows? Also what query should be used to display these rows? (I'm using Oracle 11gR2 database)
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1answer
73 views

Can I make that connection?

If I have a column with data type varchar(max) in a table that contains a big piece of text, can I make a connection between a word or a sentence in that text with another word or a sentence in ...
2
votes
2answers
972 views

Why does my query run faster after I force full table scan?

I have a MERGE statement that took forever to execute the select as the table it is running from (SUB_DATA) is rather big (read 1.4 Tb, 700 million rows). My SELECT looks like this. SELECT ...
0
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1answer
265 views

Patients profiles database

I am making software for patients in hospitals. I want to make an option that if a doctor has prescribed a drug that interacts with another drug that the patient already uses, a warning will appear ...
3
votes
1answer
252 views

SQL query returns different results when index is dropped

In SQL Server 2000 SP4, I have a query SELECT <fields no aggregates> FROM PS_VED_VCH_TAO5 A ,PS_BUS_UNIT_TBL_AP B ,PS_RT_DFLT_VW C WHERE A.PROCESS_INSTANCE = 594170 ...
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votes
3answers
4k views

Conversion failure varchar to int

When running this code: declare @SQL NVARCHAR(max); declare @intFlag INT; set @intFlag = 2; SET @SQL = ' SELECT * into [##tmp1] FROM servicesstats_0511_0412 s WHERE department=''ACC'' and ((SELECT ...
1
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1answer
282 views

postgresql pgadmin3 queryconnect attribute does not work

I'm using Fedora 17 and pgadmin3 to auto-connect to a postgresql database with one button click. Every time I want to run an SQL statement, I have to do 4 steps, (open pgadmin3), (connect to the ...
2
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1answer
6k views

query to find closest lesser date

I have a table with rates. each rate has an effective starting date. (the ending date of any rate is implied by the existence of a record with a newer effective starting date.) I also have a table ...
1
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3answers
308 views

Same query taking 0.2 sec in Oracle database but 4 mins in SQL Server

SELECT A.Field1 FROM Table1 A INNER JOIN Table1 B ON A.Field2 = B.Field2 AND A.Field3 = B.Field3 AND A.Field4 = B.Field4 AND B.Field1 = "string1" AND B.Field2 = "string2" AND A.Field5 = (SELECT ...
4
votes
2answers
594 views

How should I best design the tables and relationships, given the following rules?

In a Pawnshop business, customers pawn, sell or buy items. A contract which specifies the customers information, the items, and the terms and conditions is created whenever customers pawn, sell or buy ...
3
votes
2answers
216 views

Finding violations of the symmetry constraint

Suppose I have a table Friends with columns Friend1ID, Friend2ID. I chose to represent each friendship with two records, say (John, Jeff) and (Jeff, John). Thus, each pair of friends should show up ...
5
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3answers
1k views

Many-to-Too-Many Relationship

I'm working on a book database. And among others, I have the following two tables (a bit simplified for the question): tblBook: ID, Title tblPerson: ID, Name Note that the tblPerson table contains ...
0
votes
3answers
60 views

Query Optimizing Request

I am very sorry if this question is structured in not a very helpful manner or the question itself is not a very good one! I need to update a MSSQL table call component every 10 minutes based on ...
1
vote
1answer
164 views

Stored procedures and network congestion

When I went to an interview, the interviewer asked me "what are the benefits of stored procedures?" and I started answering but when I said "It reduces network congestion", he suddenly said "no, it ...
1
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2answers
100 views

Easy SQL, embedded select

I have a table of zip codes with latitudes / longitudes. Unfortunately it doesn't seem to have a few zip codes. I would like to try to approximate the latitude / longitude based on other zip codes ...
2
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1answer
4k 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. ...
4
votes
1answer
1k views

Does UPDATE INDEXES work for local indexes?

I have two tables in Oracle 11.2. First is partitioned and has local index (non-prefixed): CREATE TABLE table1 (col1 INT, col2 INT) PARTITION BY LIST(col1) ( PARTITION p1 VALUES(1), PARTITION ...
2
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3answers
238 views

MySQL data view

I have a table that looks like this: +----------------------------------------+ |Name | kode | jum | +----------------------------------------+ | aman |kode1 ...
0
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1answer
100 views

Logging of incorrect row in SQL Server Integration Services

I newbie to SQL Server Integration Services and I have a problem: Data loaded from file looks like this: 1 'a' 'b' 2 'a' 'b' 1 'c' 'd' And this rows would be loaded in table like this: CREATE ...