Sql keywords

SQL HOME SQL Intro SQL Syntax SQL Select SQL Select Distinct SQL Where SQL An Or, Not SQL Order By SQL Insert Into SQL Null Values SQL Update SQL Delete SQL Select Top SQL Min and Max SQL Count, Avg, Sum SQL Like SQL Wildcards SQL In SQL Between SQL Aliases SQL Joins SQL Inner Join SQL Left Join SQL Right Join SQL Full Join SQL Self Join SQL. SQL Server uses reserved words for database operations. Therefore, if you use these words as names for objects and object parts, then your SQL statements may be more difficult to read and may lead to unpredictable. You should not use them to name program objects such as constants, variables, cursors, schema objects such as columns, tables, or indexes. Semicolon after SQL Statements?

Some database systems require a semicolon at the end of each SQL statement. SQL , Structured Query Language, is a programming language designed to manage data stored in relational databases. SQL operates through simple, declarative statements.

This keeps data accurate and secure, and it helps maintain the integrity of databases, regardless of size. The keyword here is reserved word. The ORDER BY keyword is used to sort the result-set in ascending or descending order. To sort the records in descending order, use the DESC keyword. Note 2: You cannot use the uppercase word ROWI either quoted or nonquote as a column name.

When used in this context, we know exactly the value of the returned values we want to see for at least one of the columns. Note 1: This keyword is only reserved for use as an attribute name. Background information can be found in Section 4. SQL distinguishes between reserved and non-reserved key words. SQL Key Words Table C-lists all tokens that are key words in the SQL standard and in PostgreSQL 8. Non-reserved keywords Non-reserved keywords have a special meaning only in particular contexts and can be used as identifiers in other contexts.

Most non-reserved keywords are actually the names of built-in tables and functions. Tabellen, Spalten, Sichten usw. Transact-SQL Transact-SQL reserved keywords can be used as identifiers or names of databases or database objects, such as tables, columns, views, and so on.

Note: The INNER JOIN keyword selects all rows from both tables as long as there is a match between the columns. If there are records in the Orders table that do not have matches in Customers, these orders will not be shown! When we use USING clause, that particular column name should be present in both tables, and the SELECT query will automatically join those tables using the given column name in USING clause. The following words are reserved for use in ODBC function calls. This list may not reflect recent changes ().

In addition, _FILENAME is reserved. Reserved keywords are marked with (R). There may be a situation when you have multiple duplicate records in a table.

While fetching such records, it makes more sense to fetch only those unique records instead of fetching duplicate records. SQL keywords - definition of SQL keywords by The Free Dictionary. When the default SET DATABASE SQL NAMES FALSE mode is use keywords that are names of SQL functions can be used as column names without double quotes in CREATE TABLE statements.

But when the identifier is a column name and is referenced in SELECT or other statements, the keywords must be double quoted. See list of Supported SQL statements. The list of keywords used in AlaSQL (based on the table from here). SQL Joins with On or Using I recently wrote a post about inner and outer joins , and a couple of people asked what the difference is between USING and ON. In a nutshell, you use ON for most things, but USING is a handy shorthand for the situation where the column names are the same.

The SQL DISTINCT keyword is used in conjunction with the SELECT statement to eliminate all the duplicate records and fetching only unique records.