I want to take a column with values that repeat multiple times and get that value only once and store it for later use, but at the same time I would like to get another value in the same row as that distinct column. A, B, C represent three columns. Ignore C for now. My question is: How can I
Tag: sql
Why does the following join increase the query time significantly?
I have a star schema here and I am querying the fact table and would like to join one very small dimension table. I can’t really explain the following: EXPLAIN ANALYZE SELECT COUNT(impression_id), …
The provider did not return a ProviderManifestToken string Entity Framework
An error occurred while getting provider information from the database. This can be caused by Entity Framework using an incorrect connection string. Check the inner exceptions for details and ensure …
SQL max product price [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. This question appears to be off-topic because it lacks sufficient information to diagnose the problem. Describe your problem in more detail or include a minimal example in the question itself. Closed 8 years …
SQL Server: Invalid Column Name
I am working on modifying the existing SQL Server stored procedure. I added two new columns to the table and modified the stored procedure as well to select these two columns as well. Although the columns are available in the table, I keep getting this error: Invalid column name ‘INCL_GSTAMOUNT’ C…
MySQL : ERROR 1215 (HY000): Cannot add foreign key constraint
I have read Database system concepts, 6th edition, Silberschatz. I’m going to implement the university database system shown in chapter 2 on OS X on MySQL. But I have a trouble with creating the table course. the table department looks like Creating the table course causes the following error. after sea…
#1072 – Key column ‘role_id’ doesn’t exist in table
I am trying to add foreign key on my other table but this gave me error #1072 – Key column ‘role_id’ doesn’t exist in table I have created a table named role then I created like this then when I try to alter table on my user table and I got an error like this #1072 – Key column &…
Retrieve Sqlite table data in C++
I have the code as below. I am trying to simply get data from a table i have already created. How do i get the data in the array p_fields that is defined in the callback function into a variable in …
Error (ORA-00923: FROM keyword not found where expected)
select country_olympic_name, SUM(part_gold) as ‘Number of Gold Medals’ From games.country, games.participation where participation.country_isocode = country….
How to run a SQL query on an Excel table?
I’m trying to create a sub-table from another table of all the last name fields sorted A-Z which have a phone number field that isn’t null. I could do this pretty easy with SQL, but I have no clue how to go about running a SQL query within Excel. I’m tempted to import the data into postgresq…