I have a column which can take any values from 0 to 100. Now i have a type TYPE1 which can take values 2, 4, 16 TYPE2 which can take values 8,12,64. Now i want to sort the column by TYPE1 values first and then TYPE2 values. Is there any way to do that. My column has only these values.
Tag: sql
How to delete all duplicate records from SQL Table?
Hello I have table name FriendsData that contains duplicate records as shown below I want to remove duplicate combinations rows using MS SQL? Remove latest duplicate records from MS SQL FriendsData table. here I attached image which highlights duplicate column combinations. How I can removed all duplicate com…
How to DROP multiple columns with a single ALTER TABLE statement in SQL Server?
I would like to write a single SQL command to drop multiple columns from a single table in one ALTER TABLE statement. From MSDN’s ALTER TABLE documentation… Specifies that constraint_name or column_name is removed from the table. DROP COLUMN is not allowed if the compatibility level is 65 or earli…
MySQL PRIMARY KEYs: UUID / GUID vs BIGINT (timestamp+random)
tl;dr: Is assigning rows IDs of {unixtimestamp}{randomdigits} (such as 1308022796123456) as a BIGINT a good idea if I don’t want to deal with UUIDs? Just wondering if anyone has some insight into …
Database Data Types and their equivelants in Windows Forms
I’ve read in forums about people having issues with certain data types when accessing a database from their website and windows forms application. Mostly the decimal, float and datetime data types. My DB Table, for example, the Orders table consists of the following Columns. Below each column is the dat…
How to find out where reference to primary key is used in SQL Server?
I have a table in SQL Server 2008 R2 with primary key called ID which then is used by multiple tables around the database as foreign key. How to find out by which tables it is used? I’m trying to delete that record but it’s complaining that ID is in use. Or maybe there’s an easy way to delet…
BatchSqlUpdate – how to get auto generated keys
I am using spring BatchSqlUpdate to insert a set of rows. How do I get the auto generated keys for all of the rows inserted? When doing a single insert I get the keys like this – Thanks! Answer There is no provided solution for this using BatchSqlUpdate as far as I know, but you can always query the las…
Get last record of a table in Postgres
I’m using Postgres and cannot manage to get the last record of my table: How can I do that knowning that timestamp is a unique identifier of the record ? Answer If under “last record” you mean the record which has the latest timestamp value, then try this:
MySQL syntax: What is this?
My exported SQL file contains the lines below: What do these lines mean, unlike CREATE TABLE and INSERT INTO? Answer They are variable assignments. The assignments are wrapped in executable comments in such a way that they are executed when MySQL is used and left alone if some other RDBMS is used. Furthermore…
Count number of occurrences in SQL
I have a table with the following structure: (table_name, column_name) and for each row in this table I need to query the column_name in the table_name and do a COUNT(column_name) GROUP BY …