the ORDER BY "string" and ORDER BY "string" COLLATE "en_US.utf8" queries return rows in what is effectively case-sensitive order with "A" and "a" grouped together, and lower-case of each letter coming before the upper-case of the same letter (aA bB.the ORDER BY "string" COLLATE "POSIX" query returns rows in closer to a binary / ordinal ordering with all upper-case (A - Z) grouped before all lower-case (a - z).The first four dbfiddle example queries with an ORDER BY clause show three different sort results: PostgreSQL nondeterministic collations are not supported for LIKE This solution is similar to what worked for this related answer (also on DBA.SE): Instead of sqlfiddle, I used dbfiddle, which offers several versions of PostgreSQL, for the example: If you were using PostgreSQL 12 or newer you would be able to create a new collation via the CREATE COLLATION command that specifies deterministic = false: CREATE COLLATION ci (provider = icu, locale = 'en-US-u-ks-level2', deterministic = false) The default collation for my database is en_US.UTF-8. Oracle and SQLite default to case sensitive, but have a relatively simple solution for a case insensitive sort. MySQL/MariaDB and SQL Server default to case insensitive, and that would certainly make sense when sorting most text. I have a test fiddle on !17/05cab/1, but it’s only for PostgreSQL 9.6. I know there are many questions regarding case sensitivity, but (a) most of them are old and (b) none that I have seen relate to the COLLATE clause.įWIW, I am testing on PostgreSQL 11.8. Is there a COLLATE clause value that would sort Case Insensitive? I have pored over the documentation and searched high and low, but I can’t find anything so straightforward for PostgreSQL. MSSQL: Latin1_General_BIN | Latin1_General_CI_AS MariaDB: utf8mb4_bin | utf8mb4_general_ci In other DBMSs (tested in SQLite, Oracle, MariaDB, MSSQL) I can override the default sort order using the COLLATE clause: SELECT * I have spent a long time looking for this, and I am getting mixed messages.
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