i want to use alter table but the syntax posted here: http://dev.mysql.com/doc/refman/5.1/en/alter-table.html is very confusing i do not understand what the [ ] mean or the { } mean or the pipes is there some kind of tutorial that can help me understand this? ...
I have articles table, article_comments. I want to get the value: last_modified_all of article. I need this value to be the great date of this two: the last_modified field of articles table. the last comment of article_comments last_modified column. Can someone help me? the structure is very simple, and you can guess is without pro...
Is there any difference between these two queries? select * from tbl where ts < '9999-12-31-24.00.00.000000'; and select * from tbl where ts < timestamp('9999-12-31-24.00.00.000000'); When is the timestamp function required? Is there a difference in performance? ...
What is the fastest way to reorder (resort) a table so that the physical representation most closely matches the logical, using PostgreSQL? ...
I'm trying to use a PreparedStatement with code similar to this: SELECT * FROM ? WHERE name = ? Obviously, what happens when I use setString() to set the table and name field is this: SELECT * FROM 'my_table' WHERE name = 'whatever' and the query doesn't work. Is there a way to set the String without quotes so the line looks like t...
We're very frustratingly getting deadlocks in MySQL. It isn't because of exceeding a lock timeout as the deadlocks happen instantly when they do happen. Here's the SQL code that is executing on 2 separate threads (with 2 separate connections from the connection pool) that produces a deadlock: UPDATE Sequences SET Counter = LAST_INSERT...
I have this Query: SELECT p.ProductName, dt.MaxTimeStamp, p.Responsible FROM Product p LEFT JOIN (SELECT ProductID, MAX(TimeStamp) AS MaxTimeStamp FROM StateLog WHERE State = 0 GROUP BY ProductID, State) dt ON p.ProductID = dt.ProductID ORDER BY p.ProductName; It works ...
Possible Duplicate: SQL exclude a column using SELECT * [except columnA] FROM tableA? Is it possible to exclude a column from a select * from table statement with SQL Server? I have a need for this and this is my only option other than parsing a raw SQL string to get out the required field names (I really don't want to do th...
table1 - date1 datetime not null - date2 nvarchar null I want to get the latest date of this two. select date1, date2, (CASE WHEN date1 > CAST(date2 as DateTime) THEN date1 ELSE date2 END) as DateTime) as LatestDate from table1 please note that date2 can be null. in this case, date1 win. ...
I'm unable to get SQL and Rails to play properly when trying to find Categories that are created each day, the past 7 days. So basically I want to find each Category sorted by the day they were created for the past 7 days. I found this on stackoverflow, but it isn't finding a Category that I just created: Category.all(:conditions => [...
I have a table with about 1000 records and 2000 columns. What I want to do is categorize each row such that all records with equal column values for all columns except 'ID' are given a category ID. My final answer would look like: ID A B C ..... Category ID 1 1 0 3 1 2 2 1 3 2 3 1 0 3 1 4 2...
I have two tables in sqlite: CREATE TABLE fruit ('fid' integer, 'name' text); CREATE TABLE basket ('fid1' integer, 'fid2' integer, 'c1' integer, 'c2' integer); basket is supposed to have count c1 of fruit fid1 and c2 of fruit fid2 I created a view fruitbasket; create view fruitbasket as select * from basket inner join fruit a on a.f...
Hi, I would like to select a random line in my database. I saw this solution on a website: SELECT column FROM table ORDER BY RAND() LIMIT 1 This SQL query run but someone said me that it was a non performant query. Is there another solution ? Thx ...
Hi how do I get the data by current week? Select * from Transaction where transactionDate .... ...
Hi, I have a very large table with over 1000 records and 200 columns. When I try to retreive records matching some criteria in the WHERE clause using SELECT statement it takes a lot of time. But most of the time I just want to select a single record that matches the criteria in the WHERE clause rather than all the records. I guess the...
Is there any way to insert data into multiple tables through a view in mysql? ...
Hi all, I'm a lone developer for a telecoms company, and am after some database design advice from anyone with a bit of time to answer. I am inserting into one table ~2 million rows each day, these tables then get archived and compressed on a monthly basis. Each monthly table contains ~15,000,000 rows. Although this is increasing month...
I am working on a big application on SQL Server 2008 with 60 000 stored procedures and over 10 000 tables. Is there a tool through which I can do impact analysis to find out all SPs doing a DML on a table? ...
Hi, i've got stuck with substring. On input i've got a string that looks like Sometext (123456). Those digits at the end are random. I need to get only text from that string. ...
I'm using Entity Framework (1st time) on a SQL 2005 database for a data migration and found this very odd behavior... Up till now I never had to call the AddObject method to persist new records. SaveChanges always did the trick, so I figured the entity constructor always hooked the new entity to the data context. Now I added migration ...