CREATE TABLE dept ( department_id INTEGER NOT NULL PRIMARY KEY , department_name CHARACTER VARYING(30) NOT NULL ) ; CREATE TABLE emp ( employee_id INTEGER NOT NULL PRIMARY KEY , first_name CHARACTER VARYING(20) , last_name CHARACTER VARYING(25) NOT NULL , salary NUMERIC(8,2) , manager...
查詢處理器會先使用 OLE DB 來擷取各成員資料表中的 CHECK 條件約束定義。 這可以讓查詢處理器將索引鍵值的散發對應到每個成員資料表中。 查詢處理器會將 Transact-SQL 陳述式 WHERE 子句中指定的索引鍵範圍,與顯示成員資料表中資料列分散情況的對應進行比較。 然後,查詢處理器會建立查詢執行計畫,而此計畫的分散式...
CHARACTER_LENGTH CURRENCY CHECK CURRENT_DATE CLOSE CURRENT_TIME CLUSTERED CURRENT_TIMESTAMP COALESCE CURRENT_USER COLLATE CURSOR D DATABASE DISALLOW DATE - 請參閱 DATETIME DISCONNECT DATETIME DISTINCT DAY DISTINCTROW DEC, DECIMAL DOMAIN DECLARE
Transact-SQL (2005) how do I replace the first character ?
--CHECK列约束 create tablepersons(P_Id intNOTNULL,LastNamevarchar(255)NOTNULL,FirstNamevarchar(255),Addressvarchar(255),Countryvarchar(255),CONSTRAINTchk_PersonCHECK(P_Id>0ANDCountry='China')) 数据表修改 Management Studio 修改表 SQL 指令修改表 ...
All FILESTREAM columns must be dropped first. Use SET FILESTREAM_ON = "NULL" to delete all FILESTREAM data that's associated with a table. SET ( SYSTEM_VERSIONING = { OFF | ON [ ( HISTORY_TABLE = schema_name . history_table_name [ , DATA_CONSISTENCY_CHECK = { ON | OFF } ] ) ]...
CHAR 和 CHARACTER,请参阅 TEXT COUNTER CHAR_LENGTH CREATE CHARACTER_LENGTH CURRENCY CHECK CURRENT_DATE CLOSE CURRENT_TIME CLUSTERED CURRENT_TIMESTAMP COALESCE CURRENT_USER COLLATE CURSOR D 展开表 DATABASE DISALLOW DATE,请参阅 DATETIME DISCONNECT ...
SQL_ISV_CHARACTER_SETS = 标识可由给定用户访问的目录字符集。 (中级)SQL_ISV_CHECK_CONSTRAINTS = 标识给定用户拥有的 CHECK 约束。 (中级)SQL_ISV_COLLATIONS = 标识可供给定用户访问的目录的字符排序规则。 (全级别)SQL_ISV_COLUMN_DOMAIN_USAGE = 标识依赖于目录中定义的域且由给定用户拥有的目录的列。 (...
alter table e_task convert to character set utf8; 一、查看字符集 1.查看MYSQL数据库服务器和数据库字符集 方法一:show variables like '%character%'; 方法二:show variables like 'collation%'; 方法 一 mysql> show variables like '%character%'; ...
extract string between two characters/string, first character is 'Test Name:' and second character is line break i.e., or end of line. Extracting domain name from FQDN fully qualified domain name see example Extracting only year from getdate() function... Extracting substring between two cha...