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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Time elapsed Calculation

I need to calculated time elapsed for each user to perform his part in a transaction. The sequence is: 0 -1 - B2 or 0-B3 The table looks like the following: ...
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0answers
59 views

Modulus calculation for compound primary keys in MySQL Cluster (and other sharded databases)

In MySQL Cluster, and generally in sharded databases, how is a compound primary key's modulus calculated? Say, for example, there are two tables that have primary keys like so: CREATE TABLE Orders ...
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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 ...
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3answers
844 views

Building A SQL table horizontally VS vertically

What is a better design principle when designing SQL Server tables. One can either add columns (ie grow horizontally) or grow it vertically (ie rather adding rows) I have a situation when there are ...
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1answer
470 views

Is there any way to get the estimate cost of executing a query in MySQL?

In PostgreSQL, EXPLAIN or EXPLAIN ANALYZE will show the estimate cost of executing a query. But EXPLAIN in MySQL doesn't provide this information. How can I get the estimate cost without installation ...
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2answers
644 views

How to retrieve the Capture Instance for a given table?

Working with SQL Server 2012, I have a hierarchical table layout (TPT). All tables "inherit" from the same base table (dbo.DataObjects). All tables have history tracking via CDC enabled. I am trying ...
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1answer
166 views

creating table result in errno 150

I'm trying to create the following schema, but I'm getting errors when I'm trying to create project and staffphone tables. Not sure what is it complaining about. mysql> CREATE TABLE staff( ...
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1answer
382 views

Self-join unique pairs

I have a table (players) containing a list of players, I would like to pair up these players in a unique way, so that every player's opponent is unique every round (ie. every time the SELECT query is ...
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0answers
76 views

Efficient way to Add NON-CLUSTERED Index?

I have the following table, CREATE TABLE [dbo].[Products]( [ID] [int] IDENTITY(1,1) NOT NULL, [RetailerID] [int] NOT NULL, [Name] [nvarchar](255) NOT NULL, [Price] [float] NULL, ...
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1answer
113 views

How does the transactions interact if you set a different isolation level per connection?

I read that I can have different isolation levels per connection and in the server. The default isolation level is REPEATABLE-READ. So if I have a transaction that issues a SERIALIZED to the client ...
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1answer
156 views

Optimizing Postgres query

I've got a one to one relation from users to addresses table. Where one user can have one search address and one verified address. I've got two indexes on addresses table : Index on state field ...
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296 views

Missing rows in MyISAM tables with 10-20 billion records

I've got 2 tables with 10-20 billion records each. Currently these are in MyISAM (MySQL). They only require to be built and indexed once, after this only SELECT is used. They are currently ...
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4answers
125 views

Amount of data in a database table

I am trying to run an alter query on a table, and its giving me a Lost connection to MySQL server during query MySQL server has gone away. The query that I am running is alter table table_name ...
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1answer
483 views

Slow queries related to subqueries using aggregation

Here's a simplified version of the queries I am running: select ... from editions join edition_events on edition_events.edition_id = editions.id join events on events.id = ...
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2answers
2k views

Optimizing removal of duplicate rows from recursive CTE query

I need to write a recursive SQL query to fetch multiple projects together with their lineage from the following table: CREATE TABLE #Project ( Name VARCHAR(10), ParentName VARCHAR(10) ) INSERT INTO ...
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1answer
609 views

counter table in mysql

i was going through the book: High performance MySql 2nd edition. In chapter 4 it says: An application that keeps counts in a table can run into concurrency problems when updating the counters. ...
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1answer
2k views

Is there a way to determine automatic storage table spaces?

First off, we are on both Windows and AIX and are using DB2 ESE 9.7 FP 4. I am trying to determine dynamically whether or not table spaces are set up via automatic storage or not (so we can ...
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1answer
239 views

Relative cost of two similar queries involving XML columns

I have two queries as shown below which do the same thing. Here xmlcolumn is a column with datatype XML. I use these queries to search for a string anywhere in the XML column. I checked the execution ...
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1answer
1k views

Upgrade SQL Server 2005 Enterprise to SQL Server 2008 R2 Standard

I understand that this is not a supported path, but does anyone have any insight about how to accomplish this? I can't seem to find any documents on the subject. I need my QA (2005) to match my ...
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2answers
997 views

MySQL: CAST + SUBSTR vs. FLOOR + MOD

I have a field in a mysql database where dates are stored as BIGINT like YYYYMMDDHHMMSS (PHP: date('YmdHis')). I'm building a query, where I check the amount of rows per hour and have tried two ...
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2answers
537 views

How to link each column in sql?

I have been working around on a query given by one of my developers who works on crystal reports as a junior DBA, I always like to help them even though I am busy with other things as it will increase ...
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2answers
8k views

Connect Error (2054) - mysql_old_password issue still not solved

i use php 5.4.3 and i want to connect to a MySQL DB remotely (php script resides on a different server than the db) with normal oop way: $mysqli = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME); ...
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2answers
1k views

Factoring out subselect (with clause) ends in ORA-00904

I am trying fo factor a repetitive subquery with with but getting ORA-00904 over and over again. This is my base query which works quite well: select tka.id, tka.name, txt.text as langname, ...
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2answers
1k views

ERROR: could not find array type for datatype information_schema.sql_identifier

I am trying to run the below sql command: SELECT ARRAY( SELECT column_name FROM information_schema.columns WHERE table_name ='gis_field_configuration_stage' ); and I get the below ...
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1answer
761 views

Restore .mdf data file for a File Group in SQL Server

I have a database with three filegroups and each filegroup hosting one datafile. One of the secondary filegroups XYZ with data file xyz.ndf got updated with wrong/bad information in various tables ...
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3answers
424 views

MySQL Query - How to get most recent demographics?

I have a table that has duplicated cardnbr's. I need to pull out demographics that are the most recently used by the customer. I have a date field (lastvisit) that shows their most recently used card. ...
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698 views

SELECT value from database over ODBC wont reach the software [closed]

SQL Server 2008 R2 latest updates. SQL server ODBC driver version 6.01.7601.17514 PS!!! native drivers are incompatible with the software so i cannot use them. I cannot edit or change the server ...
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1answer
184 views

How to interpret explain sql?

SELECT DISTINCT TB.ID, TB.Latitude, TB.Longitude, 111151.293413 * SQRT( pow( - 6.185 - TB.Latitude, 2 ) + pow( 106.773 - TB.Longitude, 2 ) * 0.988392289802 ) AS Distance FROM `tablebusiness` AS TB ...
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2answers
72 views

stack data into a single column

SELECT * would result in: course_id + group ----------------- 1 + SE123 1 + BA134 2 + SE213 3 + SE223 3 + BA344 4 + SE222 I would like it be like ...
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1answer
562 views

Implementing Pub/Sub initiated from the database

I have a number of state-full Windows Services that currently poll the database looking for new or changed records in specific Tables and/or Views. For obvious reasons this limits scalability and is ...
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1answer
258 views

Show all variations of 2 characters in postgres

How would I do this in postgres : Lets say I have an x and a y and I want to show all possible combinations : xx yy xy yx How can I make postgres do this for me ?
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4answers
17k views

Retrieving row count without using Count function

I wrote a query below which shoots me a syntax error why would it do so, SELECT MAX('Row') FROM (SELECT ROW_NUMBER() OVER(ORDER BY ID DESC) 'Row' FROM USERS) Error Desc: Incorrect syntax near ...
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1answer
782 views

Cartesian Product SQL / Inserts with multiple Values Clauses

I want to create cartesian product sql query.But,I'm getting the error.Where I wrong? alter table #Personel ( Ad varchar(100) ) alter table #Masa ( MasaAdi varchar(100) ) insert into #Personel ...
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1answer
117 views

Are there situations where queries are formed geometrically?

The topic came up in this other question. We were discussing sign value on a primary key having any significance. If there are good times to use geometry in building queries the sign value could be ...
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1answer
22 views

Full text search on two tsvector columns

I'm trying to do a full text search across two columns of two separate tables in PostgreSQL 9.4.2. The tables and columns are: article.article_title keyword.keyword Where there is a many-to-many ...
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2answers
105 views

How can i use the same query for all codes?

I use this query in PHPmyAdmin, i have date that contain(date,hour),supp, price and code_product (it repeated many times) : I want to return the last price for the last date of product code ...
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0answers
32 views

Retrieving a record for the last date received and returning the value of another column in that row

I have the following query which is returning me total number of expected records : select a.New_FirstName + ' ' + a.New_LastName as 'Account Name', a.New_MPRNNumber,MAX(b.New_readdate) as 'Last SC ...
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2answers
196 views

Calculating values from three related tables, without using join or union

I have a simple basic three tables on SQL Server database: What is needed is to get the quantity available, without using joins or unions which is calculated: Quantity Available = Items Opening ...
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1answer
47 views

Logic Value of Assignment Expression

I'm doing the leetcode SQL problems and kind of confused with the code below: select distinct Num from ( select Num, case when @prevNum = Num then @count := @count + 1 ...
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1answer
49 views

How can a primary key be inserted as foreign key?

Hi I am building an order intake form that will have information submitted belonging to 3 tables. The order table will have the primary key used for the property and customer table. How can I ...
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2answers
98 views

Process staging table by getting unique rows only (incremential)

I had simple problem with etl on staging table that was answered here: Process staging table by getting unique rows only Now after apllying solution I spotted that will be unusable in production ...
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2answers
912 views

How to insert or update using single query?

I have a table test having columns id which primary key and auto incremented and name. I want to insert a new record if annd only if there are no records.For example input is id=30122 and name =john ...
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1answer
82 views

How can I create a bool column for a view based on the result of a statement?

I'm using PostgreSQL as my database. CREATE TABLE groups ( id SERIAL NOT NULL, name TEXT NOT NULL, PRIMARY KEY (id), UNIQUE (name) ); CREATE TABLE users ( id ...
0
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4answers
178 views

Single SQL query to retrieve data in a particular order (not ASC/DESC)

I have a MySQL table, let's say called reviews review_id, product_id, language_id, rating, review, author language_id ranges from 1 to 10 for 10 different languages. Let's say I determine that my ...
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1answer
73 views

Dynamic Pivot with overlapping years

I have looked and cannot find how to show the last # months in a pivot table. Everything I seem to run across codes months statically. I'm seeking a solution that shows something similar to the ...
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2answers
175 views

where in (sub query) vs join

I just want to ask about how to optimize my query. I am curious about the efficiency of using join instead of where in sub query. Can someone explain the difference? SELECT C.Customer_id, ...
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0answers
62 views

SqlServer: can one table's PK be the FK of two table's?

I have three tables project, users and proj_user. The PK of proj_user table is the FK of project and users table's pk e.g.(project_id,user_id) My question is, is it possible if the project_id and ...
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1answer
135 views

Why does mysql give different result for this summations? [duplicate]

Can someone help understand the following behavior? mysql> select (1/3 + 1/3 + 1/3); +-------------------+ | (1/3 + 1/3 + 1/3) | +-------------------+ | 1.0000 | +-------------------+ ...
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1answer
63 views

How to JOIN more than two tables?

Following is the schema of my Tables: Marks_Table (SubjectCode,TypeID,MarksObtd) Subjects_Table (SubjectCode, Subject) Types_Table (TypeID, Type) I want to Select the Marks_Table table with ...
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1answer
42 views

How to sum the buy order and sell order in one row per each ticker

I have a table containing some trading information of several tickers and I would like to divide the data into sum(Amount) for buy and sell separately, grouping by each ticker. I have one table ...