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An INSERT statement can also be used to retrieve data from other tables, modify it if necessary and insert it directly into the table. All this is done in a single SQL statement that does not involve any intermediary processing in the client application. A subselect is used instead of the VALUES clause. The subselect can contain joins, function ...
This list includes SQL reserved words – aka SQL reserved keywords, [1] [2] as the SQL:2023 specifies and some RDBMSs have added. Reserved words in SQL and related products In SQL:2023 [ 3 ]
For example, an en dash is entered using ⌥ Opt+-; an em dash (—) is entered using ⇧ Shift+ ⌥ Opt+-. Also on a Macintosh pressing and holding certain letters (the vowels and a few other letters) brings up a pop-up menu of related special characters, such as accented versions of vowels, which can be clicked on or selected numerically.
In the second example, REVOKE removes User1's privileges to use the INSERT command on the table Employees. DENY is a specific command. We can conclude that every user has a list of privilege which is denied or granted so command DENY is there to explicitly ban you some privileges on the database objects.:
Additionally there is a single-row version, UPDATE OR INSERT INTO tablename (columns) VALUES (values) [MATCHING (columns)], but the latter does not give you the option to take different actions on insert versus update (e.g. setting a new sequence value only for new rows, not for existing ones.)
However, they are still useful for command-line interfaces and plaintext comments within source code. Some recent embedded systems also use proprietary character sets, usually extensions to ISO 8859 character sets, which include box-drawing characters or other special symbols.
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In the most SQL dialects the double dash (--) can be used instead. Esoteric languages Many esoteric programming languages follow the convention that any text not executed by the instruction pointer (e.g., Befunge ) or otherwise assigned a meaning (e.g., Brainfuck ), is considered a "comment".