Some non-standard implementations of SELECT can have persistent effects, such as the SELECT INTO syntax that exists in some databases Standard SELECT statements have no persistent effects on the database. SELECT retrieves data from one or more tables, or expressions. The most common operation in SQL is the query, which is performed with the declarative SELECT statement. The SQL was adopted as a standard by the American National Standards Institute (ANSI) in 1986 as SQL-86 and International Organization for Standardization (ISO) in 1987. sql files can be read, processed or edited by any SQL-compatible database program or suitable SDK or text editor. These *.sql files may contain instructions and statements for creating or modifying database structure, such as data insertions, updates, deletions and other SQL operations. The sql files are text files written in the SQL language and contain SQL code, which is used to modify the contents of a relation database. The sql file extension is mainly related to Structured Query Language or short SQL.
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