!!! Overview
Although [{$pagename}] is a common discussion, it is really comparing Apples and Oranges.

[LDAP] is a Communications protocol and SQL (Structured Query Language) is a special-purpose programming language designed for managing data in relational database management systems (RDBMS).

A Communications protocol defines the syntax, semantics, and synchronization of communication; the specified behavior is typically independent of how it is to be implemented.[1] 

!! Servers and Clients
Any LDAP Client, like [LDAP Browsers], can communicate with any [LDAP Server Implementation].
This is not the same in SQL where each SQL Client must use a specific protocol for each SAL Server implementation.
   
!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]

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[#1] - [http://en.wikipedia.org/wiki/Communications_protocol] retrieved 2013-01-03