sql select
Used to select data from a database, which is then returned in a results set.
Example 1: Selects all columns from all users.
SELECT * FROM users;
Example 2: Selects the first_name and surname columns
from all users.xx
SELECT first_name, surname FROM users;sql select syntax
select [all/distinct] <COL1>, <COL2>, <COL3>
from <TABLE_NAME>
[join <JOIN_CONDITION>]
[where <CONDITION>]
[group by <COLUMN_NAME>]
[having <SEARCH_CONDITION>]
[order by <SORT_SPECIFICATION>]
/*
Specifically for SQL -> Oracle
LEGEND:
[...] : optional entries
<...> : your specific entry
*/return columns from table sql
SELECT *
FROM INFORMATION_SCHEMA.COLUMNS -- INFORMATION_SCHEMA is an ANSI-standard (American National Standard Institute) set of read-only views which provide information about all of the tables, views, columns, and procedures in a database
WHERE TABLE_NAME = N'Customers' -- "N" defines the subsequent string (the string after the N) as being in unicodesql select statement
Projection = Select the columns in
a table that are returned by a query
Selection = Selects the rows in a
table that are returned by a query
Join = Brings together data that is
stored in different tables by
specifying the link between themCopyright © 2021 Codeinu
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