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

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4
votes
1answer
689 views

Pull data from multiple tables in a view or function

There are 3 tables from which I need to pull data, and print it in a specific way. http://sqlfiddle.com/#!15/59481/8 Refer to this question to see how the query was produced. The version in the ...
2
votes
2answers
298 views

What is meant by churn?

I came across the following sentence in this blog post: Know your data - this helps you make the right decisions in terms of data types/nullability and churn helps with long term maintenance ...
0
votes
1answer
84 views

Update table from different table [closed]

UPDATE RBI.RBI_OV_F_DETAIL A SET (BRANCH_ID, BRANCH_NUMBER) = ( SELECT PRICE_BRANCH_ID, PRICE_BRANCH FROM RSE.RSE_SO_F_ORDERS B WHERE A.SOURCE_ID = B....
0
votes
1answer
207 views

decrement all columns entry when row is deleted

I have a column in a table containing the row_number, some kind of id number to identify the row. When I delete one row, I need the other rows to have their row_number decremented, to keep them sorted....
0
votes
2answers
890 views

Check if database has changed to determine need to perform backup

I want to check SQL server database is modified or not. Reason to check database is modified is for backup(sql database backup) purpose. So I will be doing a full backup first and if any data inserted,...
2
votes
2answers
485 views

Will a non-clustered index on a column with covering index on all the columns of table affect the Delete statement Records)?

I am trying to delete thousands of records say 35K from a table which consists like 10 million records. Delete * from Table where ScenarioID=859 I have also tried bulk deletion DECLARE @...
1
vote
2answers
674 views

How to calculate a total by comparing current and next row

I have a table with some rows: I have a few questions to accomplish the task altogether. Is it possible to calculate total of transmitted and received based on checked_date and ip and connect_time ...
1
vote
3answers
1k views

How to see percentage of existing values for all columns in mysql table?

I have three large-ish tables (~20 columns each) and I want to know what percentage of rows have a value for each column. For instance, this table: ID | TITLE | SERVING | NOTE ---...
3
votes
2answers
2k views

Getting the number of Saturdays and Sundays in a month

I am trying to get the number of Saturdays and Sundays for a given month represented by an end_date and a start date. I have been trying to understand the algorithm in the SO question here . I have ...
0
votes
1answer
37 views

Update different oracle database from different oracle database

I want to update a CLOB column in B Oracle 11g database using a CLOB column in A Oracle 11g database located in a different server. What are the different ways to do that? and which is the best and ...
1
vote
2answers
111 views

How to tune the below query

I am currently working on below table structure to pull the data/ generate any one time report. Let us consider the table name to be ABC. ID Field Value 1 Name Nagarjuna 1 Gender Male 1 ...
0
votes
1answer
4k views

The SQL server Log folder is expanding because of the SQL Dump files (what to do with it ?)

The "Log" folder SIZE in the SQL server root directory (X:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\Log) becomes too big , ~80 GB. When I checked it, I see that there are a lot of ...
-3
votes
0answers
42 views

The SQL server Log folder is expanding because of the SQL Dump files (what to do with it ?) [duplicate]

The "Log" folder SIZE in the SQL server root directory (X:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\Log) becomes too big , ~80 GB. When I checked it, I see that there are a lot of ...
1
vote
2answers
356 views

Shrink logs in between user transaction in SQL Server

I have a database where there are like billions of rows and I need to delete the data based on some condition. Initially I was trying to delete the code in one transaction and log starts growing to ...
1
vote
3answers
6k views

SQL Query in suspended state causing high CPU usage

Environment detail: SQL Server 2008 R2. I have applications running on JBoss that access the DB using JDBC driver. Issue: My online DB server was experiencing high CPU usage. Using the following ...
2
votes
1answer
386 views

MySQL WHERE if NULL select another column

This is my mysql table id date_created date_active 1 2014-06-07 18:24:38 NULL 2 2014-06-07 18:24:38 2014-06-07 18:24:38 3 2014-06-07 18:24:38 2014-06-...
1
vote
1answer
89 views

SP how can I sum the amount of all leftchild in parentid

I have this data and table structure,I am creating MySQL stored procedure to sum all the amount in the leftchild of the parentid, I don't have enough knowledge in stored procedure.and I need some help ...
2
votes
0answers
157 views

Storing URLs in a database

I am thinking about storing URL's in my database, but I am not sure whether the way I use is an efficient way to do things or not. Table name : url url_id (Primary Key & Auto Increment) url_value ...
2
votes
1answer
225 views

Identify unattached File Size in SQL Server

From a similar post on this forum, I have modified the below code as per comments and able to get the orphaned files in the drives. The code is : EXEC sp_configure 'show advanced options', 1; ...
1
vote
1answer
41 views

SQL Server 2008 R2 - Change distributor schedule

We have configured SQL 2008 R2 replication. Distributor is configured in continuous mode, publisher is scheduler is set to execute after every six hours. Now we want to change distributor schedule ...
2
votes
2answers
24k views

How to empty a column in mysql [closed]

I have table Like This ID | name | prize | ____________________ 1 | Mike |Handphone 2 | Josh | 3 | Sony | PC 4 | Jack | let's say my table have 1000 rows. If I want To Empty only the Prize ...
3
votes
2answers
85 views

Selecting minimum value in top grouping only

I have a query built in Oracle 10 which produces a set of data like this: EMP_ID WORK_DT TIME_TYPE ---------- --------- --------- 12345 19-DEC-14 10 12345 18-DEC-14 10 ...
0
votes
0answers
39 views

My database engine cannot see one of the drives

I installed SQL Server 2012 on a VM that has two harddrives, C and E. I can log into the Database Engine, but when I attempt to attach a database that is on E, Drive E is not available. Only Drive C ...
5
votes
2answers
320 views

T-SQL brain teaser: find non-overlapping sets

I would like to ask for help coming up with a query, which can identify groups on non-overlapping records. Here is a sample scenario (admittedly contrived). Let's say I have employees who are ...
1
vote
1answer
333 views

How to insert values into a junction table?

I add values into my two tables using the code below, but I also have a junction table called book_main_cover and I want to add data into this table to make a connection between book_id and ...
0
votes
1answer
672 views

Run CDC Cleanup job at specified time

I have enabled cdc and using it , it works fine now the problem is that we have many tables in a database and also we have many databases so how to configure cdc cleanup job to run again and again ...
0
votes
2answers
47 views

Get all the users that are managed by a targeted manager

I have the following model: Table user: (id, name, direct_manager_id) Table customer: (id, name, managed_by_id) i.e. users can have another user as their direct manager, Customers can be managed ...
0
votes
1answer
94 views

Why Does the Update Statement also updates indexes?

I am currently learning about SQL queries and how indexes work with them, and I ran into a situation that I don't understand. Let's say I have this query for that updates a tables' values with another ...
-1
votes
1answer
38 views

How to manage two tables in SQL Server [closed]

i have two tables offer1 and offer2 The two tables are Offer1 Offer2ID|OfferName|OfferExpiryDate Offer2 Offer2ID|OfferName|OfferExpiryDate now i have third table which keeps record ...
1
vote
1answer
125 views

Deleting duplicate rows with condition [duplicate]

I have posted a similar question before, but this one is a little modified. I have a table with 4 columns as shown below. ITEMCHARGE CPT4 EFF_DATE CPT4MOD 326.8 29075 ...
0
votes
1answer
340 views

Oracle SQL Statement alter index and add partition

I have an index in which I have to remove one column and reindex back for rebuild: ALTER INDEX <index_name> REBUILD; Is it possible to add partition when I rebuild an index. Partition will ...
0
votes
1answer
49 views

optimizing a select query of 1.5 million entry

I have the following query: SELECT s0_.id, s0_.lowresimageurl FROM app_instagram_shop_picture s0_ FORCE INDEX ( idx_deleted_shopId ) LEFT JOIN app_instagram_shop s1_ ON s0_.shop_id = s1_.id AND ( s1_....
1
vote
2answers
440 views

Deleting duplicate rows with condition(Using SQL and LINQ)

I have a table with 5 columnsID,CPT4,CPT4Mod,ItemCharge,Eff_Date. Deletion Condition: When rows exists with duplicate CPT4and CPT4Mod field values but different ItemCharge and Eff_Date values, ...
1
vote
1answer
642 views

How to Select the First (or last) entry for a specific day

I have a table "AttendanceRecords" with entries like this EntryID UUID PRIMARY KEY, StafID UUID REFERENCES staffmembers(ID) NOT NULL, ArrivalTime TIMESTAMP NOT NULL, DepartureTime TIMESTAMP For one ...
0
votes
1answer
45 views

How can I aggregate multiple results from another table using something like BOOL_AND?

I'm using PostgreSQL as my database. CREATE TABLE users ( id SERIAL NOT NULL, name TEXT NOT NULL, PRIMARY KEY (id), UNIQUE (name) ); CREATE TABLE groups ( id ...
0
votes
2answers
1k views

insert inserted id to another table

Here's the scenario: create table a ( id serial primary key, val text ); create table b ( id serial primary key, a_id integer references a(id) ); create rule a_inserted as on insert to a do ...
6
votes
2answers
546 views

Why doesn't a delete increase unused space in a table?

If I populate the following table: IF OBJECT_ID ('dbo.CleanTableTest', 'U') IS NOT NULL DROP TABLE dbo.CleanTableTest; GO CREATE TABLE dbo.CleanTableTest (FileName nvarchar(4000), ...
10
votes
2answers
15k views

Outer Apply vs Left Join Performance

I am Using SQL SERVER 2008 R2 I just came across APPLY in SQL and loved how it solves query problems for so many cases, Many of the tables I was using 2 left join to get the result, I was able to ...
0
votes
1answer
238 views

Turning multiple fields in column to row

I have an issue that has really stumped me in SQL Server. I have recently had the need to insert a row in to a table, made up from a number of columns. I want to make the one row up from something ...
2
votes
4answers
492 views

Help understanding SQL Server 2005 execution plan

One of my stored procedure has long execution time (average around 4 to 7 minutes). Now I trying to tweak it an make it run faster. I am looking at execution plan and two things I see that using ...
7
votes
1answer
133 views

Is there a performance hit by breaking out tables into different schemas in SQL Server?

Is there any kind of performance hit when querying by placing tables in different schemas in SQL Server. For instance if I had 2 tables, Table1 and Table2, and put Table1 into the test schema and ...
16
votes
1answer
5k views

How to get the MAX row

In SQL Server I've always found it a pain to get the max rows for a dataset, I'm looking for a list of the methods to retrieve the max rows with some guidance on performance and maintainability. ...
4
votes
1answer
15k views

trying to turn XML into heirarchical SQL tables, can anyone provide a good explanation of two parts of this code example?

I am trying to learn how to turn XML into heirarchical SQL tables. I have found an old code snippet from a Microsoft forum which is basically what I am trying to do, but I was wondering if someone ...
-2
votes
4answers
4k views

Is there a SELECT statement to subtract rows of the same column?

Column 1 is the mem_id, Column 2 is the Transaction type C and D, and Column 3 is the Amount Owed. So I want to return Column 3 "Amount Owed", but it has to be C-D in Column 2 for each member. thanks, ...
1
vote
0answers
117 views

PostgreSQL query slow when using tsvector and ORDER BY despite having index

Running on a large database (around 1.5G) The following query takes about 70 seconds to run, SELECT x FROM DBText x WHERE x.status = 2 AND x.publishedTime < 4574590406397 AND x.service = '...
2
votes
1answer
1k views

Get products of category plus all child categories till leaf nodes

We have a hierarchy which looks this: Now the problem is that most products are only connected with 1 category, which is most of the time the lowest level. I am trying to get ALL products below a ...
0
votes
2answers
861 views

Suspended query causing high CPU usage

Environment detail: SQL Server 2008 R2. I have applications running on JBoss that access the DB using JDBC driver. Issue: My online DB server was experiencing high CPU usage. Using the ...
0
votes
1answer
110 views

How to delete row from table later than date?

I have a simple table: MyTable: -Id int primary key -Name varchar(MAX) -Deleted bit Now i want delete rows created later that 15.12.2014. But how can you see i don't have a any date columns in my ...
0
votes
1answer
590 views

How to find out who is active and locking the oracle database?

At work, we are sharing oracle credentials among many developers. Often time team runs heavy adhoc queries on the database and it is causing lot of trouble to oracle server. We are working to fix ...
3
votes
1answer
363 views

Recursive CTE to find unique slug

I have an article table where I want the slug to be unique. CREATE TABLE article ( title char(50) NOT NULL, slug char(50) NOT NULL ); When the user enters a title e.g. News on Apple, I want ...