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

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17
votes
5answers
580 views

SARGable WHERE clause for two date columns

I have what is, to me, an interesting question on SARGability. In this case, it's about using a predicate on the difference between two date columns. Here's the setup: USE [tempdb] SET NOCOUNT ON ...
5
votes
3answers
114 views

Selecting one row from each group based on a Varchar field

Given a table Avenger whose data looks like this: id Avenger Type Power 1 Captain America foo 2 2 Captain America bar 3 3 Me foo 5 4 You ...
0
votes
1answer
116 views

Update query for Minimum absolute difference in Access [SQL]

I have 3 tables in an Access db. Table_1 and Table_2 are where the source data comes from and I am filling Table_3. Table_1 has the following fields: Acct_Name Amt Table_2 has the following ...
1
vote
1answer
54 views

Storing Friendships: Should I use a multivalued column to retain Friend Identifiers?

Say I have a table UserFriendlist that has the columns: Id (set as Primary Key) UserId FriendListIds And let us suppose that it holds the following values: ...
0
votes
0answers
17 views

what does “\” symbol mean?

I am new to database learning and came across this \ symbol. I googled but couldn't find what it meant. It was used in the context Q = R\S. (The = sign here is equivalent to)
16
votes
7answers
373 views

Group daily schedule into [Start date; End date] intervals with the list of week days

I need to convert data between two systems. First system stores schedules as a plain list of dates. Each date that is included in the schedule is one row. There can be various gaps in the sequence ...
0
votes
1answer
205 views

Suitable schema to record email sent and response received and invoicing in DB

When a form submission is made on a website: An email with form's details is sent to a set of recipients email addresses stored in a DB. The email contains a link for the recipient to show interest. ...
0
votes
0answers
5 views

postgresql - how to find and extract text from a description column

I'm trying to create a new table using data from an existing. I have the following structure: Table "public.def" Column | Type ...
1
vote
2answers
24 views

Using Variables to contain column names for SQL Server Merge statemtns

I'm trying to automate the column list grab for a merge job, and running into a bit of a head scratcher. I don't want to have to manually type out all of the column names, and thought I may be able to ...
0
votes
1answer
12 views

SQL 2012 Availability Group issue - The core cluster resources do not move when we initiate AG fail-over

I have a Windows 2012R2 cluster with two nodes and a File Share quorum. I am running SQL 2012 SP2 and I have configured a test AG with a dummy database. When I fail-over the AG, the Availability ...
11
votes
3answers
169 views
+250

Database stored procedure with a “preview mode”

A fairly common pattern in the database application I work with is a need to create a stored procedure for a report or utility that has a "preview mode". When such a procedure does updates, this ...
1
vote
1answer
20 views

Using a join operation with conditionals

I have two tables that I'm working with in my database. I am using SQL Server 2014. One is 'versions', that contains version_id, version_number, start_date, end_date and server_id. The other is ...
1
vote
1answer
10 views

Is DISTINCTROW in MS-Access the same as selecting all the fields and doing a group by on all of them?

I was looking though some queries in MS Access, and I found an SQL keyword I was unfamilar with called DISTINCTROW, from what I can tell, it's the same as an SQL GROUP BY which includes all the ...
0
votes
1answer
30 views

List of queries run

I'm looking for a DMV query for SQL Server 2008 R2 which shows me all queries (full history) run by a specific user. I have this code for now: SELECT * FROM sys.dm_exec_query_stats qs CROSS APPLY ...
0
votes
1answer
29 views

Altering column data SQL

I have a set of car data, one of the columns represents the registration year. I want to change this column to age. As the data is from 2010 I assume that the following statement should calculate the ...
0
votes
1answer
624 views

Select Query takes more than a minute to retrieve data

I have a table that has 99 columns, all of them are not needed but they were there when we started. There is a Primary Key (Objectuid) which is a GUI and has the Clustered Index on the PK. The Table ...
1
vote
1answer
17 views

Display dates not in ascending for To_Char

can i know why and how i can solve the problem whereby if i use To_Char it does not sort the date in ascending. Below is my code select distinct To_Char (attendance_Date, 'dd/mm/yyyy') from ...
1
vote
1answer
23 views

Using SQLCMD with Variables

Im trying to do some general script that i can use to run the same INSERT/UPDATE or DELETE statements on different site databases. This was my first attempt which works just fine, but i have to copy ...
2
votes
2answers
193 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 ...
0
votes
1answer
18 views

Get data from previous years dynamically

I have a table with columns id, fname, date_field. date_field's records are: 2011-03-01 2012-03-01 2013-03-01 2014-03-01 2015-03-01 2016-03-01 I want the data for the past 2 years for each record ...
0
votes
1answer
102 views

Restore InnoDB from .frm files

My database crashed and my PC and I now only have the .frm and .ibd files left. Is there any way to restore my database?
1
vote
1answer
27 views

Duplicate key value violates a unique constraint

I've been looking at other posts. It seems many people have had this problem, but I'm somewhat new to Postgres and tried other solutions with no luck. I have ny_stations table: CREATE TABLE ...
1
vote
1answer
16 views

index creation - Slow Query - PostgreSQL 9.2

I've got the following query: SELECT * FROM ( SELECT split_part(full_path, '/', 4)::INT AS account_id, split_part(full_path, '/', 6)::INT AS note_id, split_part(full_path, '/', 9)::TEXT ...
-1
votes
2answers
20 views

Capitalize only the first letter of a name

I have a table Vendors that contains a column VendorContactFname, which is written in lowercase. I want to capitalize only its first letter. I am thinking of concatenating an Upper on the first ...
2
votes
1answer
22 views

Relating 2 tables with possible wildcards?

I am having trouble getting the desired results when trying to relate the following tables. NULL in the following table essentially means that if it is not an exact match with another row then choose ...
0
votes
1answer
15 views

On the fly MySQL balance

Please excuse my English translation that makes by Google Translate I need to solve the following in a MySQL query without php or another language: In the “A” column I have a string value, in ...
3
votes
2answers
46 views

SQL Server - What access do I have during a transaction rollback?

As the title says, do I have read/write access to my entire database while it is rolling back a transaction? Or read/write access to only the tables that the transaction did not write to? What is the ...
0
votes
2answers
43 views

How can I create a join on three tables, each from a different database?

Here is a simplified example of what I'd like to do: SELECT a.create_time, b.create_time FROM DOB.dob_state AS a JOIN numID.numID_history AS b ON a.create_time = b.create_time; I'd like to join ...
0
votes
0answers
28 views

best practice to remove leading zeros when writing data to a destination

I have a query like in my other question DBA Question with Source Code of Select statement And i want to remove the leading zeros of the customer Number (KUNDE) with the answer of this question ...
1
vote
2answers
42 views

Join two tables using pivot combining two columns in one table

I have two tables in this format: Job_Skill ID_Skill Min_Job Idea_Job Max_Job ===================================== 1 0 0 1 2 0 1 1 7 1 ...
1
vote
1answer
21 views

Select rows until a condition is met

Given: CREATE TABLE T ( x int not null primary key , y int not null ); INSERT T(x,y) VALUES (1, 0) ,(2, 0) ,(3, 0) ,(4, 0) ,(5, 3) ,(6, 0) ,(7, 4) ,(8, 0) ,(9, 0); The ...
0
votes
2answers
23 views

Using Select Statement to get column name and table name from the same table

I have a table containing 2 Columns : Column1 (table_name) and column2 (column_name) like this : (Column 1) (Column 2) |Column_Name | Table_Name | -------------|------------| ...
1
vote
1answer
23 views

Tricky condition for PostgreSQL UPDATE query

I need help with a PostgreSQL query. I have a Django app + pg backend, where users post interesting URLs (or links) and can then comment under such links (called replies). There are two pg tables to ...
1
vote
1answer
23 views

sql getting sum of calculated columns

How can I get the sum of TotalAmount as single value for example Product Name UnitPrice Quantity Discount% Amount SharingCost% ShippingCost CustomsCost TotalAmount pro1 ...
0
votes
1answer
8 views

A different number of AFTER INSERT trigger alarms in SQLite and SQL Server

I have trigger CREATE TRIGGER [Foo] AFTER INSERT ON [Bar] BEGIN UPDATE Log SET count = count + 1; END When i execute query insert into Bar (ColumnName) values ('SomeValue1'), ('SomeValue2'), ...
1
vote
1answer
428 views

Display a one-to-many relationship in one row

I have a "one to many" relationship in two tables: Table "products" contains: product_id, product_descr Table "packing" contains: product_id, package_id, package_desc One product has often more ...
8
votes
3answers
253 views

Unexpected CASE evaluation logic

I always understood that the CASE statement worked on a 'short-circuit' principle in that evaluation of subsequent steps does not take place if a prior step is evaluated to true. (This answer Does SQL ...
0
votes
1answer
22 views

Display the the result of a substraction in a MySQL query (1 table)

I've made a table that looks like this: stop (table name) -cityName {PK} -schedule {PK} -price -routeNo Basicly the customer wants to know what's the cost difference between 2 different stops by ...
2
votes
1answer
43 views

How do I guarantee inventory numbers are unique across all tables?

I have an assortment of physical objects which need to be inventoried and each type of object has it's own table. For two example objects, let's use 'swords' for the table containing different swords ...
-1
votes
0answers
14 views

PL/pgSQL trigger function syntax error at END; [on hold]

I'm writing a simple trigger function, as seen below. For context, it's meant to enforce uniqueness of a key across multiple tables. It will be made more generic once I've got it working. CREATE OR ...
-1
votes
0answers
20 views

Functional Dependency Diagram From the Result of a Query? [on hold]

I was wondering if someone could explain to me how this works. I understand the concept of functional dependency diagrams i.e being given a set of attributes and split the tables using the diagram to ...
0
votes
1answer
105 views

counting the number of a specific word in one SQL column

I'm trying to make a survey like a referundum to know if my neighboors in my small building are for or against a colectif compost to reduce the organics wastes. For this tool vote I'm using PHP and ...
2
votes
1answer
177 views

SQL Server 2012 - Dropping Snapshots takes hours

We recently did a SQL Server upgrade from 2005 to 2012. We have a nightly job that drops a snapshot of an active database. The snapshots gets created again later in the day. Before upgrading, in SQL ...
30
votes
5answers
61k views

How do I use currval() in PostgreSQL to get the last inserted id?

I have a table: CREATE TABLE names (id serial, name varchar(20)) I want the "last inserted id" from that table, without using RETURNING id on insert. There seem to be a function CURRVAL(), but I ...
0
votes
3answers
62 views

Get all records from inner joined tables if second table does not have data

I follow below syntax by which I achieve the result. but it takes time IF NOT EXISTS(select * from #tblxyz) BEGIN INSERT INTO #tblxyz select NULL END Select a.* FROM tblabc a ...
2
votes
2answers
46 views

Select rows where smaller row does not exist

Consider the following table data: ID NAME 1 Kshitiz 2 Aman 5 Aakash 6 Manjeet Here there are records missing between 2 and 5. What query can I use to select row 5 in this table?
1
vote
1answer
1k views

How can I select data from two differents servers?

I have two databases: data1 and data2 in two different servers (server1 and server2). I am trying to join two tables of my two databases in MySQL like this: SELECT left(a.code,9) as fourn, ...
1
vote
1answer
40 views

Can the subquery be simplified/optimized?

Here's a simplified version of a query I run. I've removed a bunch of key/value pairs for simplicity. The constraint is that I can't change anything outside of the ARRAY function; but the ARRAY ...
0
votes
0answers
61 views

Trying to find a MIN() workaround for an indexed view

I'm trying to speed up a SQL Server query using indexed views and I have one slow element which I think is due to the use of GUIDs for the particular comparison column. The GUID can be mapped to an ID ...
0
votes
1answer
206 views

Sessionizing Log Data Using SQL window functions: tweaking a query (incrementing session ID and event length)

I'm referencing to a very good blog entry, that describes how to sessionize log data with SQL window functions. I'm no database pro and I don't really understand the logic behind this query (you can ...