Hello, sql stands for structured query language. MSSQL, MySQL, Postgresql, Oracle all these are database servers. All they differ in several things like structure, security, resource utilization, system requirement, etc. but the syntax of queries in all these databases is almost same. select, insert, delete, modify, update are some of the queries but syntax of all these queries are exactly same in all database servers. Oracle is one of the best database server which provide highest security, advanced features, more suitable data types like VARCHAR2, NVARCHAR2, NCHAR, PLS_INTEGER, LONG, RAW, LONG RAW, CLOB, BLOB, BFILE etc. such database types are supported only in Oracle.
in oracle you use pl sql language to build query you can start read about it pl sql tutorial and oracle database