What are the difference between relational algebra and SQL

Relational algebra	SQL (Structured Query Language)
(i) The relational algebra is a procedural query language.	(i) SQL is a programming Language for relational databases.
(ii) Relational algebra is performed recursively on a relation and intermediate results are also considered relations.	(ii) It is used for storing and managing data in RDBMS.
(iii) Relational algebra consists of a set of operations that take one or two relations as input and produce a new relation as their result.	(iii) SQL consists of a collection of relations, each of which is assigned a unique name.
(iv) The fundamental operations in the relational algebra are select, project, union, set difference, Cartesian product and rename.	(iv) SQL uses the set of commands to define database schema. These are- CREATE, DROP, ALTER. and has three clauses- select, from, where.
(v) Example: Find all tuples in which the amount lent is more than 1200. Ans.:	(v) Example: Find the names of all branches in the loan relation. Ans.: select branch-name from loan