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παραδείγματα χρήσης (πολλές φράσεις με μετάφραση)
ετυμολογία

SQL$94620$ - translation to ολλανδικά

SQL STATEMENT THAT RETURNS A RESULT SET OF RECORDS FROM ONE OR MORE TABLES

Subquery; Count (SQL); SQL query; SQL queries; Subqueries; Nested query; Select sql; Sql select

SQL

n. een gestruktueerde programmeertaal om vraagstukken op te lossen; een programmeertaal die met informatie uit gegevensbestanden zoekt

Structured Query Language

RELATIONAL DATABASE LANGUAGE THAT ALLOWS TO EXTRACT FROM DATA TABLES A SERIES OF RECORDS WITH SELECTION, SORTING AND COMPUTATION CRITERIA, OR TO UPDATE, DELETE OR ADD NEW RECORDS

SQL programming language; SQL language; Structured Query Language; Structured query language; SQL keywords; Sql; Comment (SQL); Grant (SQL); SQL database; SEQUEL; SQL script; SQL Servers; Transaction Control Language; SQL (programming language); SQL datatypes; SQL functions; Structure Query Language; SQL data types; .sql; Revoke (SQL); Sql types; ANSI SQL; Procedural SQL; Alternatives to SQL; Criticism of SQL; Distributed SQL processing; History of SQL; ISO/IEC TR 19075; Data types in SQL; Procedural extensions to SQL; Interoperability of SQL statements

(Computers) taal gebruikt in gegevensbanken voor definiëren van onderzoeken, SQL

index file

DATA STRUCTURE FOR QUERY OPTIMIZATION IN DATABASES

Table index; Index file; IDX (file format); Clustered index; Non-clustered Index; Dense index; Sparse index; Nonclustered index; Index (database); Database indices

indexlijst

Ορισμός

SQL

Structured Query Language (Reference: ISO 9075, DB, 4GL)

Εμφάνιση περισσότερων ορισμών

Βικιπαίδεια

Select (SQL)

The SQL SELECT statement returns a result set of records, from one or more tables.

A SELECT statement retrieves zero or more rows from one or more database tables or database views. In most applications, SELECT is the most commonly used data manipulation language (DML) command. As SQL is a declarative programming language, SELECT queries specify a result set, but do not specify how to calculate it. The database translates the query into a "query plan" which may vary between executions, database versions and database software. This functionality is called the "query optimizer" as it is responsible for finding the best possible execution plan for the query, within applicable constraints.

The SELECT statement has many optional clauses:

SELECT clause is the list of columns or SQL expressions that must be returned by the query. This is approximately the relational algebra projection operation.
AS optionally provides an alias for each column or expression in the SELECT clause. This is the relational algebra rename operation.
FROM specifies from which table to get the data.
WHERE specifies which rows to retrieve. This is approximately the relational algebra selection operation.
GROUP BY groups rows sharing a property so that an aggregate function can be applied to each group.
HAVING selects among the groups defined by the GROUP BY clause.
ORDER BY specifies how to order the returned rows.

https://en.wikipedia.org/wiki/Select (SQL)