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1answer
67 views

MS Access: adding column if not exist (or try/catch it)

this is an easy question, but I can't find out the solution... I have to check if a column exists and add it if the test is negative. How can I do with only sql code? This is the syntax for SQL ...
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93 views

Helpme undestand MDX exists function

After spend almost decade in OLTP world I got the courage to try to build my first CUBE. I installed VS2012 and created Business Intelligence -> Analysis Services. I did build Data Source Views, Cube ...
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1answer
27 views

Determine existence in recursive working table

I have a query that needs to check for existence of each input row type in another table, but it is unnecessary and inefficient to check for existence of subsequent rows of the same row type if one is ...
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1answer
48 views

How can I create a bool column for a view based on the result of a statement?

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

Use if exists in postgresql [closed]

I know about the exists feature, but that does not help me with the given situation. What I want is: Check if some row exists, and if exists then check for an another row if row exists. Here's ...
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1answer
169 views

Performance of checking for data in related tables

NB: this question is purely academic / to help improve my understanding of SQL Server performance. Given a master table which relates to one or more other tables, how would you determine the best ...