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Erwin Brandstetter

Vienna, Austria

Database expert.

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Top Questions
36 votes

USING construct in JOIN clause can introduce optimization barriers in certain cases?

postgresql performance optimization join select asked Apr 12 '12 at 8:06
dba.stackexchange.com

22 votes

“Recheck Cond:” line in query plans with a bitmap index scan

postgresql index postgresql-9.4 query-plan asked Jul 8 '15 at 0:25
dba.stackexchange.com

22 votes

Syntax highlighting: <!-​- language: lang-none --> does not seem to work for block quote

bug code-formatting syntax-highlighting markdown-rendering asked Sep 7 '15 at 15:45
meta.stackexchange.com

17 votes

PostgreSQL functions returning void

postgresql stored-procedures null plpgsql void asked Nov 30 '11 at 1:15
stackoverflow.com

17 votes

Naming conflict between function parameter and result of JOIN with USING clause

postgresql join plpgsql parameter naming-convention asked Jul 2 '15 at 23:54
dba.stackexchange.com

15 votes

Constraint defined DEFERRABLE INITIALLY IMMEDIATE is still DEFERRED?

postgresql constraints postgresql-9.1 asked Apr 5 '12 at 16:19
stackoverflow.com

14 votes

Description page for the “Edit questions and answers” privilege needs an edit

bug status-completed stackoverflow privileges asked Oct 10 '11 at 6:19
meta.stackexchange.com

13 votes

Why is code excluded from phrase search?

bug search exact-phrase asked May 17 '17 at 19:27
meta.stackexchange.com

12 votes

Surprising results for data types with type modifier

postgresql datatypes cte debugging cast asked Sep 26 '15 at 0:36
dba.stackexchange.com

12 votes

Inconsistencies in the rendering of lists

bug status-completed markdown markdown-rendering asked Nov 4 '14 at 1:39
meta.stackexchange.com

1 2 3

Top Answers
1108
Select first row in each GROUP BY group?
stackoverflow.com

753
PostgreSQL error: Fatal: role “username” does not exist
stackoverflow.com

734
Insert text with single quotes in PostgreSQL
stackoverflow.com

364
Create unique constraint with null columns
stackoverflow.com

361
Select rows which are not present in other table
stackoverflow.com

341
Ignoring time zones altogether in Rails and PostgreSQL
stackoverflow.com

339
How do I (or can I) SELECT DISTINCT on multiple columns?
stackoverflow.com

307
PostgreSQL Crosstab Query
stackoverflow.com

306
Check if value exists in Postgres array
stackoverflow.com

274
PostgreSQL LIKE query performance variations
stackoverflow.com

273
Are PostgreSQL column names case-sensitive?
stackoverflow.com

270
How to check if a table exists in a given schema
stackoverflow.com

269
How to implement a many-to-many relationship in PostgreSQL?
stackoverflow.com

264
Best way to check for “empty or null value”
stackoverflow.com

256
PostgreSQL create table if not exists
stackoverflow.com

252
Give all the permissions to a user on a DB
stackoverflow.com

246
How to concatenate columns in a Postgres SELECT?
stackoverflow.com

227
Best way to select random rows PostgreSQL
stackoverflow.com

212
Query a parameter (postgresql.conf setting) like “max_connections”
stackoverflow.com

208
Concatenate multiple result rows of one column into one, group by another column
stackoverflow.com

205
Fast way to discover the row count of a table in PostgreSQL
stackoverflow.com

200
Query for array elements inside JSON type
stackoverflow.com

192
Does PostgreSQL support “accent insensitive” collations?
stackoverflow.com

186
Calculating and saving space in PostgreSQL
stackoverflow.com

177
Optimizing queries on a range of timestamps (two columns)
dba.stackexchange.com

177
How to use RETURNING with ON CONFLICT in PostgreSQL?
stackoverflow.com

175
Postgres manually alter sequence
stackoverflow.com

175
How do I query using fields inside the new PostgreSQL JSON datatype?
stackoverflow.com

173
Export specific rows from a PostgreSQL table as INSERT SQL script
stackoverflow.com

170
Pattern matching with LIKE, SIMILAR TO or regular expressions in PostgreSQL
dba.stackexchange.com

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