因此,我们可以使用触发器等高级 SQL 功能来关联表: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 -- Suppose we have two distributed tables CREATE TABLE little_vals (key int, val int); CREATE TABLE big_vals (key int, val int); SELECT
SQL_ISV_KEY_COLUMN_USAGE = 标识目录中定义的列,这些列被给定用户约束为键。 (中级)SQL_ISV_REFERENTIAL_CONSTRAINTS = 标识给定用户拥有的引用约束。 (中级)SQL_ISV_SCHEMATA = 标识给定用户拥有的架构。 (中级)SQL_ISV_SQL_LANGUAGES = 标识 SQL 实现支持的 SQL 一致性级别、选项和方言。 (中级)SQL_ISV_...
CREATE TABLE page_views ( site_id int, url text, host_ip inet, view_time timestamp default now(), PRIMARY KEY (site_id, url) ); SELECT create_distributed_table('page_views', 'site_id'); 一旦表中填充了数据,我们就可以运行聚合查询来计算每个 URL 每天的页面浏览量,限制到给定的站点和年...
SQL 語句中使用的元素發行項 2025/01/03 6 位參與者 意見反應 下列元素會用於先前所列的 SQL 語句中。 元素 base-table-identifier ::= user-defined-name base-table-name ::= base-table-identifier boolean-factor ::= [NOT] boolean-primary boolean-primary ::= comparison-predicate |( 搜尋條件 ) ...
Keyring service consumers require that a keyring component or plugin be installed: To use a keyring component, begin with the instructions here. To use a keyring plugin instead, begin with Section 8.4.4.3, “Keyring Plugin Installation”. If you intend to use keyring functions in conjunct...
mysql_keyring_service_st Struct Reference MySQL Server Plugin Services This service allows plugins to interact with key store backends.More... #include <service_mysql_keyring.h> Public Attributes int(*my_key_store_func)(const char *, const char *, const char *, const void *, size_t) ...
SQLConnection analyze(resourceName:String = null, responder:Responder = null):void Gathers statistics about database indices and stores them in the database. SQLConnection attach(name:String, reference:Object = null, responder:Responder = null, encryptionKey:ByteArray = null):void Adds another data...
// send a custom parameter to your special service let layer = new MapImageLayer({ url: serviceUrl, customParameters: { "key": "my-special-key" } }); dateFieldsTimeZone Property dateFieldsTimeZone String |null |undefinedreadonly Since: ArcGIS Maps SDK for JavaScript 4.28 The time zo...
groupKey * optional Key identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group. clone Method clone(){SpatialReference} Returns a deep ...
sqlcmd Locate the Transact-SQL reference articles To find T-SQL articles, use search at the top right of this page, or use the table of contents on the left side of the page. You can also type a T-SQL key word in the Management Studio Query Editor window, and press F1. Common Tra...