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

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Adding a constant IF not in an other table

So I have this query. SELECT * FROM `Comment` WHERE `Target` = '".$_GET['pp']."' AND `Id` NOT IN (SELECT `Target` FROM `Delete` WHERE `Type` = 'comment') ORDER ...
0
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1answer
59 views

I am not sure why I am getting the “Invalid column name”, same code works on my other calculators… [closed]

In the following code: sqlCommandString1 = "Select Correction FROM Wlookup " + "WHERE Citystate = " + ComboBox1.Text Citystate lookup to result correction value. There are no spaces, and I tried ...
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2answers
235 views

Aggregate function / query in Oracle 11g

I am working in Oracle 11g. I have been racking my brain all day trying to figure out how to write a particular SQL statement (am a Java/.NET Developer, would not consider myself a SQL expert) I ...
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2answers
3k views

Query Optimization required - Subquery using Inner Join

Could anybody advise how can I optimize this query below please? SELECT IT.[iInternalTransactionID] , IT.[iInternalAccountID] , C.[iContractID] , IT.[dtTransactionDate] AS TransactionDate , ...
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4answers
17k views

Why use both TRUNCATE and DROP?

In the system I work on there are a lot of stored procedures and SQL scripts that make use of temporary tables. After using these tables it's good practice to drop them. Many of my colleagues (almost ...
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3answers
466 views

Nested table as condition prevents using index

The following query joining a subquery does a TABLE ACCESS FULL when the master-table uses nested table as condition. When the condition is a simple =, the same query does an INDEX RANGE SCAN as ...
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2answers
383 views

How to inner join some tables and outer join others?

I'm certain I'm going to be embarrassed by the eventual answer, but I've been googling around and banging my head against the wall and can't figure it out. I have four tables described below. I'm ...
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1answer
6k views

ORA-00933: SQL command not properly ended

I have created a database link to a remote database, MIGRERDOSSIER.US.ORACLE.COM, then I use it to insert records in a table in a local database. Here is the request I am trying to execute: insert ...
0
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1answer
39 views

Building a query programatically

I have three variables $color, $size and $category. Each oh them can be a specific value or may refer to all entries.I want to fetch all products that are $color = "red", $size = "Medium" and any ...
2
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1answer
168 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) ...
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2answers
57 views

What subquery do I need to calculate this report?

I have two tables: tickets and comments. I need to run a report that shows me which ticket is "neglected" meaning that there has not been a comment in X amount of time. If I was to do this in PHP, I ...
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2answers
4k views

Sql statement to compare two table

I have two table with the same structure, i want an sql statement to compare them and see any modified line, deleted or added Table Product1 : ________________ |Product | Price| |Product1 | 10 | ...
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1answer
41 views

pass data from deleted table to another

This is the situation: I have a table, with name TABLE_1 I would like delete TABLE_1 and then create another table with the same name and some of its columns. TABLE_1 has records, but I need to pass ...
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3answers
1k views

Optimize select on subquery with COALESCE(…)

I have a large view that I use from within an application. I think I've narrowed down my performance problem, but I'm unsure how to fix it. A simplified version of the view looks like this: SELECT ...
1
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2answers
381 views

Get only the oldest entry in a join

So I have a table bugs |bugid| title| the table is lacking a date column. But when creating a new entry, most likely always a new entry gets created in bugnotes as well saying "bug created" with the ...
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3answers
225 views

Preventing SQL Injection

I know that this is very dangerous: EXEC sp_executesql 'SELECT * FROM ' + @Table But, is this safe from SQL injection? IF EXISTS(SELECT * FROM information_schema.tables WHERE TABLE_NAME = @Table) ...
1
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1answer
72 views

Merging a Select query into a view

I am using DB2. So, I have a view which is working fine. It is : Select Atr.Ssn_Tx ,Names.First_Na ,Names.Middle_Na ,Names.Last_Na ,Reff.Ref_Cd_Desc_Tx Suffix_Na ,MBR.PRSN_MBRSH_ID From ...
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2answers
10k views

Restoring MySQL Tables from .ibd, .frm and mysqllogbin files

For some reason, when I try to open up my tables that are stored in .frm and .ibd files (whether on MySQL or phpmyadmin) it gives me a syntax error or it says it does not exist. I've read the other ...
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2answers
4k views

Way to do MERGE with update source when target not match?

I am trying to write a stored procedure that will take new values from a temp table, merge them into an actual table, giving me the ids of the inserted rows, and the rows that already exist matching ...
4
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2answers
1k views

Is it possible for SQL Server to miss rows on a select * where PK = “value” query

We have just migrated an application to an SQL Server 2008 R2 from SQL Server 2005 and moved from a physical to virtual hosting environment. I have a very strange error in our application and I was ...
5
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1answer
322 views

Numeric data type with variable significant digits

I need to implement a data type which should preserve the last zeros in the decimal points in SQL Server 2008 R2. Example of the data are 1.002 1.210 0.00100 0.1401 My clients get lab measurements ...
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3answers
10k views

How to import Sybase .db file into SQL Server database?

I've been given a Sybase .db file by a client and I need to import that into a new SQL Server database so that I may see the data as well as the tables and their relationships, any ideas on how that ...
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0answers
55 views

Database Structure Definiton

This is a question more so on the table definition vs actual programming. I have 6 sets of potentially 255 unique fields. I have a potential of getting 40 million records per year of these. For the ...
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votes
1answer
4k views

How to INNER JOIN and OUTER JOIN within the same table?

I am using PostgreSQL and I have the following tables: Product ID | Name | Price Receipts ID | Month | Quantity | Product_ID (FK) Sales ID | Month | Quantity | Product_ID (FK) I am trying to ...
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2answers
241 views

Difference Between SELECT and select in oracle sql

The algorithm used to find SQL in the library cache is based on the ASCII values of the characters that make up the statement. Means The SELECT instead of select statement will be parsed again ...
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2answers
118 views

Query Cache Implementation Details

I am new to DBA stack exchange & this is my first question. Kindly help me in finding a low level documentation for Query Cache module in MySQL since I am planning to work with the source code of ...
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1answer
23 views

Select the last logged change before a specified time from a change list

I want to get the last change for all issues issue, that was made before a specified end time. I have 3 tables. projects +---+------------+ |ID |project_key | +---+------------+ |1 |bug_tracker | ...
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1answer
4k views

How to preserve the original order of elements in an unnested array?

Given the string: 'I think that PostgreSQL is nifty' I would like to operate on the individual words found within that string. Essentially, I have a separate from which I can get word details ...
0
votes
1answer
110 views

Batch converting indexes to keys [closed]

I have a legacy MS SQL Server database where all the primary and foreign keys were created as indexes. I am developing the new version of our software with Entity Frameworks, which I have learned ...
5
votes
1answer
376 views

Query to find optimal filegroups for objects

I have been assigned a task to create four file groups (one per volume) locate tables so that they are located in a manner that during an ETL process no filegroup is being read and written to at the ...
2
votes
2answers
88 views

I need help optimizing a not that complicated query that returns unexpedcted performance problems

I have a table that stores details about incoming and outgoing phone calls such as when a call was made, or when a call was received, the phone number of the caller, and the phone number of the ...
0
votes
2answers
191 views

Database search with multi joins

I have a MySQL database and I want to perform a little bigger search. I have about 10k records in one of the tables and It's expected to grow, but slowly. The biggest problem is that to perform the ...
2
votes
1answer
42 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
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1answer
88 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 ...
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3answers
9k views

Select query to retrieve values even if are null

I need some help in a query. Need to retrieve data from 1 table, even if one of the field has null value. Here's an example: Select name, SUM(credit) as credit From expenses Where name like ...
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2answers
261 views

getting one day timestamp in mysql

Please consider the following stored procedure I have: ORIGINAL Stored Procedure: -- -------------------------------------------------------------------------------- -- Routine DDL -- Note: comments ...
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2answers
207 views

Are these linked server queries susceptible to SQL injection?

I'm using a stored procedure to generate a create table script on the fly based on parameters passed into it. I am validating that the server exists, and then validating if the table exists in the ...
0
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1answer
43 views

Problem with foreign keys

I do ALTER TABLE bdt.auth ADD CONSTRAINT `depositor no.` FOREIGN KEY ( `depositor no.` ) REFERENCES bdt.depositors( `depositor no.` ) ON DELETE CASCADE ...
1
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1answer
246 views

How to make the SQL query more efficient?

I use mysql under Linux. My table is about 8000000 rows. The table has index(advertiser_id,activity_date),(activity_date,advertiser_id,activity_type). The table is looks as following: activity_date ...
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2answers
1k views

How to make a table name an attribute in PostgreSQL?

I have received hundreds of tables in PostgreSQL with identical structure and each containing similar data of a different day, so that the table name is the date of the data. I would like to Union ...
0
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1answer
22 views

Creation of a simple field failed in MySql [duplicate]

CREATE TABLE bdt.transactions ( `transaction no` int UNSIGNED NOT NULL AUTO_INCREMENT, data date , by int NOT NULL , hours int NOT NULL , ...
0
votes
1answer
41 views

Output another word instead of the word in the table in a query

Suppose I have a table where I have a field which can have to values: "enabled" and "disabled". Suppose want my query to output "unblocked" instead of "enabled" and "blocked" instead of "disabled". ...
0
votes
1answer
3k views

How to join 3 tables together given 2 many-to-many relationships tables in between?

I have 3 main tables: Person, Publication and Conference and 2 many-to-many link tables in between: person_publication and person_conference I want to join all 3 main tables together (showing me all ...
2
votes
1answer
189 views

Why is this second query more expensive than the first?

While reading Graph Databases book, I came across this excerpt: I can't figure out why the second query is more expensive than the first. Indeed, both filter on the Bob person. May anyone ...
3
votes
2answers
2k views

Are ORDER BY clause & ROW_NUMBER duplicating functionality when I need top n queries

I have a table that tracks violations for a student. I want to count the number of violations and select top 2 violators from each class. The query would look like this SELECT * FROM ( SELECT ...
-1
votes
1answer
286 views

database normalization to 3NF [closed]

I am just at a complete lost. I need help with this. There should be 12 tables (or perhaps 11 since one table has just a single attribute) when you are finished with the normalization and merging of ...
0
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2answers
60 views

Design for table with multiple links to other table

I am designing a database to keep track of our network equipment. My db has 2 tables: sites & circuits (circuit = cable) & (site = property location) Each circuit runs between two sites, so ...
1
vote
1answer
394 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
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1answer
519 views

Return Parents With Only One Child

In a Parent and Child relationship, I'm trying to return Parents that only have one Child and a where clause applied to the only child firstname like 'tom' t-sql pseudo: parents with only one child ...
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0answers
173 views

Retrieve SPID For SSRS Request

Is it possible to determine what SPID was created to execute a SSRS report? I am trying to prevent users from running the same report multiple times. So what I was thinking of doing was retrieve the ...