A core SQL statement, SELECT retrieves data from one or more tables or other sources of row set data such as views or table-valued functions.

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How to query for 'First showed up as'

Given the following table: Date Trd (INT(10)) Code (VARCHAR(10)) T-Date 1-Jan-14 1 B 1-Nov-13 1-Jan-14 2 B 3-Oct-13 ...
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1answer
737 views

SQL output formatting

I want this: "ACCOUNT_ID","MAJOR_VERSION","MINOR_VERSION","COUNTRY","ACCEPTANCE_TIMESTAMP","AGREEMENT_ID" "abcdefgh-1234-5678-ijkl-mnopqrstuvwx","20110901","1","CN","1329574013737","tos" But I get ...
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2answers
74 views

Difference between the given queries

I am required to retrieve the list of pno ( product_id ) for the products which were purchased by two customers. For this, I have been given two relations which are ( along with the attributes ) as ...
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1answer
6k views

Select fields from multiple tables

I want to make a query a little complicated, and I'm not able to do it alone. I have the following tables: Table color: id_uo P id_cor PF id_area F text_cor Table area: id_area P ...
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4answers
57 views

How can I use MySQL variables in subqueries?

I'm trying to run the following query, but it keeps getting "reduced" and failing. Cannot get MySQL to provide any information as to why. Here's the query: SELECT * FROM animals WHERE name IN(SELECT ...
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1answer
28 views

Oracle : Is my DISTINCT function working properly?

I have alphanumeric values as my primary key. I am querying my database in two different ways and finding different results. It is almost certain that I might be missing some key point in my queries. ...
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1answer
15 views

Extract date and time separately from a time with time zone column [closed]

I have a table in PostgreSQL 9.3 with the following column ...., created_at time with time zone NOT NULL DEFAULT now(), ..., When I do a select created_at from trails; I get this ...
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1answer
35 views

Update rows in a table with an index column starting from 0 with consecutive numbers

I have a few tables in a Oracle db with some "rule": The INDEX_COLUMN must start from 0 and must be consecutive numbers and the column NRCRT must start from 1 and also consecutive numbers. I've made a ...
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2answers
149 views

Error on simple Select statement: Subquery returned more than 1 value

When I query a table select * from tableName it returns error msg Msg 512, Level 16, State 1, Line 2 Subquery returned more than 1 value. This is not permitted when the subquery follows =, ...
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1answer
325 views

selecting same column twice for different value

I have a table like this; event_id pair versus score 1 1 11 100 1 1 12 0 ... 1 11 1 0 1 12 1 50 Now I want to ...
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2answers
62 views

PostgreSQL, merge join results

I have 2 tables with common columns and would like to know if it's possible to request this 2 tables by merging the results. Table "job" : parent_id, target_id, start_date, end_date, jobposition_id ...
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2answers
119 views

MYSQL Select Distinct with SUM

I am developing a Stocks management application, the Portfolio register table has 4 columns, other than date and registry_key, and it looks like this: ---------------------------------------- | ...
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1answer
334 views

MySQL - How to replace a given value from multiple columns when using SELECT?

I need to SELECT a set of rows of a given table whose structure looks like - 1º line is the name of columns A01 A02 A03 A04 A05 ... A200 99999 99999 10 753 99999 ...
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1answer
46 views

Move/Copy unique entries only from TableA to TableB, if it's not in the destination table

I'm required to move every unique entry from TableA to TableB, it the unique entry from TableA is not already in TableB. Both tables look the same, they don't have any keys, but the combination of to ...
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1answer
347 views

Filtering the results of a SELECT query to avoid certain words in the value of a column?

I have a table called videos with a column named title and there is a set of words (around 50 words as of now but the number of words may increase) which is the knowledge base for filtering the ...
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1answer
339 views

Run and Save multiple SELECT statements

Within a Postgres function I would like to run a number of SELECT commands. For each SELECT command I would like to output written to separate text files. What is the best way to implement this? ...
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1answer
101 views

Is there any performance difference between a group by statement and nested select statements in sql?

I am curious to know about the differences between using group by statement and nested selects to achieve the same result. for example consider I have two tables such as the following: tblPurchase ...
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1answer
47 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 ...
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1answer
61 views

How do I select the value with SERIAL data type in postgres [closed]

I want to know how to select values from a column that has SERIAL data type. I already try to do that but the output is like this 'Resource id #3', and not just '3' I use SERIAL so I dont have to ...
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2answers
90 views

SELECT query with referenced subqueries

How does one reference the currently-grouped by field in a subquery? Consider a table with the following data: Client Status Size 1 A 500 1 B 1500 2 ...
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2answers
5k views

How to return a result set from oracle procedure ?

How can i return a result set from a stored procedure in oracle ? suppose i want to return a table from a simple select statement such as this : Select * from tblTest I tried this but this seems ...
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1answer
13k views

MySQL: split value in column to get multiple rows

I have some data in a table like so: product_id categories 10 9,12 11 8 12 11,18,5 I want a select statement that would produce this output: product_id ...
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1answer
111 views

Get all items from list table which don't have a successful log entry for 'sent' in log table

How might one retrieve items that when joined either don't have a specific field (sent), or if they do have that field (sent) then they have an additional field (failure_reason) as well for every sent ...
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3answers
102 views

prepared statements are not inserted

i am new to JDBC and trying following code. Could not find the error in it try{ Connection con = ConnectionProvider.getCon(); stmt=con.prepareStatement("insert into ...
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1answer
55 views

Should the value of a select max be indexed when the where clause is already indexed

I have a customer_orders table in a schema designed to be shared between multiple companies. Each customer_order has an invoice number that should always start at 1 and increment based on company ...
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1answer
316 views

Conditionally limit MySQL SELECT query

My goal is to select rows from a mysql table, but according to certain column. Normal SELECT would be: SELECT ti.id, ti.userid, ti.date, ti.duedate, ti.datepaid, ti.subtotal, ...
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1answer
311 views

Order of where clause evaluation

If I have a MySQL table which has content from the last 3 months I actually do the following: SELECT SQL_BUFFER_RESULT SQL_CACHE count(id) cnt FROM `mDelivered` where _campaign = 2 and `session` = ...
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2answers
12k views

MySQL: Join one Row in a table with two Rows in other table

In my MYSQL Database COMPANY. I have two tables, like below in my diagram (arrow shows relations): `users` `user_login` +--------------+ ...
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2answers
109 views

SQL and Multiple Indexes

Consider the following table: i | a | b | c -------------- 0 | 1 | 2 | 3 1 | 4 | 5 | 6 2 | 7 | 8 | 9 3 | x | y | z The table, in the end, will have several thousand rows, and even more columns then ...
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1answer
5k views

How can I select the latest record having one state where no later records exist with any other state?

I want to select the last record (by datetime) having a given state where no later records exist with any other state for each given "widget". widget state timestamp ------ ----- ...
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3answers
229 views

How can I select data and the total to cursors?

I have a table like this: ID | Name ------------ 1 | AA 2 | AA 3 | AA 4 | BB I want to select all rows where Name like 'AA' in a cursor and get the count from this result in another ...
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1answer
33 views

Select and update specific mysql data in single query

I am trying to first select data from a row which contains certain characters. I would then like to update and append new data into another row of those items that were selected. This is my current ...
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1answer
56 views

MySQL: Select two values of two columns and compared their values exchanging them each other

I need to find a way to select one random row where the subscriber is not also leader (in the same or any other row). Something like this: (just to have an idea) SELECT `leader`,`subscriber` FROM ...
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1answer
196 views

Simple select query taking too long

I have been having a hard time with this query, I have a webpage which is supposed to run this query a dozen of times, and with an execution time up to 40 - 50 seconds per query, you can see how this ...
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1answer
145 views

Efficient way to get last 10 rows of each group in SQLite, can CTE help?

Consider there is a table of job runs history with the following schema: job_runs ( run_id integer not null, -- identifier of the run job_id integer not null, -- identifier of the job ...
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1answer
78 views

How to find the price based on the given range

Here i need to find the price of the qty based on which price range the qty lies. In the first date(2015/01/01) 5 quantities have been sold and we made entries from (1 to 5) ,On second day for 10 ...
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1answer
40 views

Select Unique Fields with Max Values in Each?

I have a table with names, numbers, and timestamps on the data. I want to know how to select a unique instance of each name based on how recent the timestamp is. Addy (text), NW (number), UDate ...
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2answers
46 views

Granting Select access to all tables within a specific Database in MS SQL

I have a server that has multiple databases that are contained within that same server/project. I am using MS SQL Server 2012. I have a special role set up with 3 users that are apart of that role. I ...
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2answers
48 views

sql problem with multiple linked tables

I have an Oracle db and the following tables: raportor: id id_pct_lucru 58382 327342 ses_rap id an status 1 2012 I 21 2013 I 41 2014 D ch_trat id fk_id_raportor ...
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1answer
54 views

Prioritizing values in select statement in ORACLE

Due to the JOIN for the communication method (Phone, email etc) we get alot of duplicates because a company can have multiple communication methods (CICM.CLIENT_VALUE). My question is... Is there a ...
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3answers
1k views

Lock mysql table to prevent select and insert at the same time

I know this question has been asked earlier and I have also read the documentation. But I guess I'm stupid not understand. I have a code that inserts a row and the row should be unique in several ...
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1answer
82 views

Select not repeated results from same tables in different databases

I have 3 tables in 3 different databases which are exactly the same. I'm trying to sync from this 3 databases to a master database as shown in the picture below: Right now I am running the same ...
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1answer
194 views

Count distinct values of a column and insert them to another table

So, I have a database for logs and statistics. But, the amount of data sent is too high, so I was thinking of grouping the data into another table. So the structure of the original Database is: ID ...
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1answer
162 views

Select last record from my table [closed]

I am new to SQL and PHP. I'm having a problem with selecting the last record from my table. I run the following query: SELECT * FROM 2521118 ORDER BY id DESC LIMIT 1 My table name is 2521118 and ...
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3answers
174 views

If in mysql I have string `xxx yyy` - how can I SELECT this if user input `xxxyyy`?

My online-shop in PHP (OpenCart). On site we have product-search. For example product have name iSport 220, and if user search input string is iSport220 we must show this product. And vice versa. ...
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2answers
608 views

SQL Server user cannot select from a table it just created?

I'm having trouble understanding permissions in SQL Server (in this case SQL Server 2012, but not sure how version-dependent this issue is). I can create a database, create a login/user on master, ...
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1answer
135 views

The cost of left out join versus a select [closed]

I'm currently working with Ebean for database abstraction. My test database is Postgresql 9.3 I turned on logging for the SQL queries to test some code behavior. So, assume 2 tables, OneToMany ...
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1answer
96 views

Select range of non-identical date from different table

On MySQL5 with innoDB, I have sensor data in multiple tables, all with an ID and a DATETIME field, like so (two tables shown, but there are more). The IDs and DATETIMEs are not identical between ...
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1answer
176 views

CONCURRENT SELECT's SLOW … LOCK IN SHARE MODE

My Table has 25 Million rows total and 6 million rows satisfying below where clause. Select 1: select max(stamp) from Table where type = "string" LOCK IN SHARE MODE ; 6000+ seconds Select 2: ...
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1answer
80 views

Replace nested “select with count” with outer join? is this possible?

SELECT c.classid , c.classname , (select count(s.id) from students s where s.classid = c.classid and status = 'failed') as noOfFailed, (select count(s.id) from students s where ...