Structured Query Language (SQL). For questions about the language, not Microsoft SQL Server (tag sql-server).

learn more… | top users | synonyms (2)

1
vote
1answer
57 views

What is the generally accepted method and tools for profiling MySQL queries?

Profiling database queries is difficult, and dependent on database technology. In MySQL, what is the usual (or, in deference to that, a great) process for profiling a query? For example: Run the ...
1
vote
1answer
547 views

Way to run SQLCMD without storing password in text format

Is there a way to run sqlcmd from a batch file where I don't want to store the password in plain text format. I have done some research and found the system variables method(store password in system ...
0
votes
1answer
372 views

Select post and concatenating all categories it belongs to

I have 3 DB tables POSTS +----------+----------+----------+ | id | title | content | +----------+----------+----------+ CATEGORIES +----------+----------+ | id | title | +---------...
0
votes
1answer
38 views

selecting rows that have n foreign key conditions satisfied

I'm trying to filter a master table rows based on 2-more conditions from the relative foreign key relation, i came up with this which is working fine, but i just can't convince my self that it's that ...
1
vote
0answers
316 views

Stored procedure taking much longer than query [closed]

I have a simple code segment that runs in about 1 second when run alone, but more than 5 minutes when deployed as a stored procedure. I'm using sql server 2008. Unfortunately, I can't post the code ...
1
vote
3answers
644 views

How to get the first or last row in ordered result set, depending by column value?

I have the follwoing result set from the table PUNCHREPORT EMPLID Name PUNCHDATE PUNCHTIME DEVICETYPE .................................................................. 70 ...
1
vote
1answer
469 views

Running queries directly on DB2 databases

Just have a general query, if it is really fine or safe to run long select queries on RDBMS production Databases specifically DB2? If NO, what are the major risks and issues in executing select ...
3
votes
0answers
193 views

Using Import Wizard with Access - No null values

I am trying to import a table from Access to SSMS using the Import Wizard but when I do the resulting table has a lot of empty strings instead of the NULL values that I am expecting. How do I make ...
0
votes
1answer
69 views

two auto incrementing columns

OK I have hit an issue, now I was going to look at having two auto incrementing columns, but I cant using InnoDB. So I am after a Solution. I have a table called queue. Everything to do with my task ...
1
vote
1answer
48 views

How can a dba at a non-profit heathcare SMB use existing customer data to find out information about potental customers? [closed]

Now maybe this isn't a question for a dba Q&A board, I could be wrong; If I've misjudged this, please send my question elsewhere in the SE network. I work at a non-profit healthcare SMB, and ...
0
votes
1answer
82 views

Postgresql Function Trying to Insert into 1 row instead of 2

Postgresql 9.3, Mac OS X 10.6.7 I created this function and I would like to insert both results into the same row. Obviously the way I have it inserts into 2 rows. First, here is the Table T1: ...
8
votes
4answers
399 views

Store millions of rows of denomalized data or some SQL magic?

My DBA experience doesn't go much further than simple storage + retrieval of CMS style data - so this may be a silly question, I don't know! I have a problem whereby I need to lookup or calculate ...
6
votes
1answer
2k views

Optimizing concurrent updates in Postgres

I'm running concurrent Postgres queries like this: UPDATE foo SET bar = bar + 1 WHERE baz = 1234 Each query affects the fixed K number of rows, and I can't find a way to enforce the order in which ...
1
vote
2answers
137 views

Oracle patching

Hi everyone I'm a student and I need a help with Oracle patch's. My DB 10.2.0.5.0 I don't understand how to check which of CPU and PSU patch's were installed. When I try to use sql select * from sys....
1
vote
0answers
387 views

Error on job - need to troubleshoot

Need Suggestions: One of our Production Servers contains a job (Daily run) which gets the Data from another Server and dump into local DB. From last couple of days, it is failing with the reason "...
0
votes
1answer
84 views

Database design Problem for the web-app

Hello I am in a problem of designing a web-app database schema. Suppose I have 10 shops and every shop gives deals on every different day Sunday, Monday and so on and for limited time period like ...
2
votes
0answers
50 views

“Wide” vs “Long” Database Structure - Is there a logic when to use which? [duplicate]

I'm currently setting up a database to house records for an application I'm writing and am trying to come up with the most efficient DB structure to use... Of course I know that there are as many ...
0
votes
1answer
96 views

Create SP for inserting data from a table to a table

I have a table that has 1 record where one field may have 2 values separated by commas (in that cases I have to create 2 records with those values separated in 2 row and the other field values are the ...
1
vote
0answers
123 views

Join and aggregate result and insert blanks for missing appendants

Consider these two simplified tables: CREATE TABLE "sources" ( "id" serial NOT NULL, "name" text NOT NULL, CONSTRAINT "sources_pkey" PRIMARY KEY ("id") ); CREATE TABLE "values" ( "...
0
votes
1answer
65 views

SQL - referential integrity - Foreign key and Check constraint

Please let me know if below two declarations are same. create table R1 ( a INT PRIMARY KEY, b INT references K(w)); Note: K is a table with single attribute w as primary key create table R1 ( a ...
0
votes
0answers
220 views

Cohort analisis for gamers activity

I want to do some cohort analysis of gamer activity in my games. By cohort I mean some set of users who registered (or had first activity) on some particular date. For example: users registered on 16 ...
0
votes
1answer
38 views

SQL - Query on table creation, referential integrity

Please let us know what does the below definition means on table creation. CREATE TABLE A(w INT PRIMARY KEY); CREATE TABLE B(x INT PRIMARY KEY REFERENCES A(w) ON SET NULL) As per my understanding, ...
2
votes
1answer
184 views

How do I write a mysql query to combine data from related tables into a single summary?

I'm having trouble defining the data in a query for a chart. I want to summarize data from the first table and combine it with a data summary from the second table. Products - (serial_number, date) ...
0
votes
1answer
176 views

how to clean huge Dbwarden QueryHistory table

dbwarden is Comprehensive database monitoring solution for SQL Server 2005+ which i am using. i found that dba_LongRunningQueries – Runs every 5 minutes. This will run usp_LongRunningQueries to ...
11
votes
1answer
279 views

Rejoining range seek on nullable composite index?

For the following schema and example data CREATE TABLE T ( A INT NULL, B INT NOT NULL IDENTITY, C CHAR(8000) NULL, UNIQUE CLUSTERED (A, B) ) INSERT INTO T (A) ...
4
votes
2answers
88 views

List minutes instead of grouping by them

Looking how to list minutes 1 to 120 from a 2 hour interval timestamp field instead of getting each minute from both hours together. What I want is something like this: min COUNT(*) 1 ...
0
votes
3answers
95 views

How to return last used record?

I have simple table called ips with 2 field ip and address, which schema is following CREATE TABLE IF NOT EXISTS `ips` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `address` varchar(255) ...
1
vote
0answers
122 views

Testing equivalence in strings with different character sets

I have to synchronize a number of tables with string columns between two databases: the source Oracle 10.2.0.3 NLS_CHARACTERSET WE8MSWIN1252, NLS_LENGTH_SEMANTICS BYTE the destination Oracle 10.2.0....
0
votes
2answers
499 views

Check and Retrieve those results where a cell(row) contains atleast one value from many values in a column [duplicate]

Let me give you an example : I have a table (name = posts) which contains following rows: id | title | .... | names 1 | . | . | . | . | . | 4 ...
0
votes
2answers
2k views

NULL value returned when concatenating a string in SQL while loop! [closed]

I'm trying concatenate a string in a while loop, but it only returns NULL. Is there something I'm missing? declare @o int = 10000000/1000000; declare @i int = 0; declare @s nvarchar(200); while @i &...
8
votes
2answers
29k views

How to use COALESCE with multiple rows and without preceding comma?

I'm trying to achieve the following: California | Los Angeles, San Francisco, Sacramento Florida | Jacksonville, Miami Unfortunately, I'm getting ",Los Angeles, San Francisco, Sacramento, ...
1
vote
1answer
471 views

Simple query not returning blank records

Very simple example here to a very frustrating treasure hunt for the mystery character. I have a table with a varchar(1) NOT NULL column - everything default - ANSI_PADDING & NULLS are ON for the ...
0
votes
0answers
608 views

What would be the most efficient way to store a text messaging (SMS) database

I'm creating a database to store incoming and outgoing text messages for a program that will be responding to text messages. The app has multiple potential responses depending on the message it ...
2
votes
1answer
10k views

Select from a list of values from JSON encoded data

I have saved the details of the product in JSON format. I am wondering how to select from a list of values from a "JSON_ENCODED DATA" For Example I want to select TV with screen_type as LED or LCD. ...
-1
votes
1answer
77 views

Query to retrieve data based on several where conditions ( Not off Topic , Answer provided below is right ) [closed]

Database : Mysql 5.5 i have a table T1 containing 4 columns : No. , Height , start_time , end_time In column height i have 3 distinct values only : Small Medium High Now i ...
3
votes
1answer
2k views

SQL hourly data aggregation in postgresql

I am a newbie with database so I'm seeking your help with this one. I have a table containing time series data. 2012/01/01 00:10, 10 2012/01/01 00:30, 5 2012/01/01 01:00, 10 2012/01/01 01:40, 10 ...
2
votes
1answer
588 views

Log shipping - failed over to secondary, how to fail back

SQL 2012 I've been researching and testing Log Shipping as a DR solution. I got the two servers setup. Log shipping is in place and verified to be working correctly. I failed over by restoring the ...
1
vote
1answer
43 views

Limit balancing results by a column

I have a web crawler that have a table with tokens to crawl and each token have a fk_location column that is the website where that token must be processed. I also have a function that returns me the ...
0
votes
2answers
468 views

Get Date Limitation

So what I need is a limitation for the user of the funded contracts. So this is what I am trying to implement. I am trying to let the user enter dates within the year 2014, which will bring up how ...
2
votes
2answers
197 views

Limiting read access in postgres to few rows

We have a requirement where we want to limit the maximum no. of rows that a select query can return when its done using a particular login. So basically we would like to append a limit clause to any ...
-1
votes
1answer
2k views

combining two CTE in a single query

Here i have two CTE and i need to select values from these two CTE as a single query. I can able to select values from a single CTE at a time but i dont know like how to merge these two CTE and select ...
0
votes
1answer
94 views

How can I control the order of a query regarding to inner join

I have 3 tables. They have table_a 5m records table_b 20m records table_c 20m records I'm performing the query below. SELECT * FROM table_a a INNER JOIN table_b b ON a.a_id = b.a_id AND b....
2
votes
2answers
5k views

Run “USE” with linked server alternatives

I am using SQL server linked servers and find some difficulties while running queries. Below is the actual query. USe testdb SELECT 'Identitiy property OFF' where COLUMNPROPERTY( OBJECT_ID('Table_1')...
1
vote
2answers
565 views

Multiple SELECT vs single SELECT over TCIP

My question is a performance one: I need to select roughly 400+ rows, i know their ids. currently i loop in code and fire off multiple queries over tcp/ip - because its easy: ... select [columns] ...
2
votes
2answers
282 views

Design of an application log database

We are generating logs like following example(this is a table no actual pipes): 2014-06-10 09:00:03.457 | Channel1 | Operation3 | Function15 | 15ms 2014-06-10 09:00:08.245 | Channel2 | Operation5 | ...
-1
votes
0answers
11 views

SQL output question [duplicate]

The results shown below show each branch name, the number of accounts opened at the branch, the number of employees working at the branch, and the number of customers from the same city. Write a ...
2
votes
2answers
177 views

Create a result for a line chart with dates

I have this table in SQLite which I use to record the risk level identified in vulnerability assesments according to the day the scan was performed. This table looks like this: Scan Date | Risk ...
4
votes
3answers
993 views

Calculating the maximum seen so far for each point in time

What I'm trying to calculate is a bit tricky to describe, so please bear with me... I have a table with product numbers, and the price of each product each week over a period of 4 years. Price can ...
2
votes
1answer
45 views

Table Compression [closed]

If I create a table like Create table test ( value int, value2 int ) WITH (DATA_COMPRESSION = PAGE) and after executing this create table command I alter table to create a clustered index on ...
2
votes
2answers
389 views

My database has been deleted suddenly on the server how to recover it?

I'm running an application on windows server that connects to a SQL Server database. Today, when I opened SQL Server Management Studio, I was surprised the database is not in the list of the ...