Creates a unique index on a table. Duplicate values are not allowed: CREATE UNIQUE INDEX index_name ON table_name (column_name) 注释:用于创建索引的语法在不同的数据库中不一样。因此,检查您的数据库中创建索引的语法。 CREATE INDEX 实例 下面的 SQL 语句在 "Persons" 表的 "LastName" 列上创建一个名为 "PIndex" 的索引: CREATE INDEX PIndex ON Persons (LastN...
SQL Create Database, Table, and Index Create a Database To create a database: CREATE DATABASE database_name Create a Table To create a table in a database: CREATE TABLE table_name ( column_name1 data_type, column_name2 data_type, ... ) Example This example demonstrates how you can...
DROP TABLE dbo.t1; GO CREATE TABLE dbo.t1(c1 INT, c2 INT); WITH Nums AS (SELECT 1 AS n UNION ALL SELECT n+1 FROM Nums WHERE n<20 ) INSERT INTO t1(c1,c2) SELECT n,2 FROM Nums; CREATE INDEX i1 ON t1(c1); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. ...
通过CREATE FULLTEXT STOPLIST (Transact-SQL)创建停用词列表(StopLists),通过ALTER FULLTEXT STOPLIST (Transact-SQL)向停用词列表中增加和删除停用词(Stopword),通过ALTER FULLTEXT INDEX (Transact-SQL)更新全文索引引用的停用词列表,实例代码如下: CREATE FULLTEXT STOPLIST stoplist_name FROM SYSTEM STOPLIST; ALTER...
SQL语句新建数据表 主键,索引,约束 CREATETABLE[dbo].[T_SendInsideMessageRec]([SendInsideMID][uniqueidentifier]NOTNULL,[ReceiveMobile][nvarchar](20)NULL,[SendTime][datetime]NULL,[Content][nvarchar](200)NULL,[result][nvarchar](100)NULL,[remark][nvarchar](100)NOTNULL,CONSTRAINT[PK_T_SendInsideMessa...
CREATE [ UNIQUE ] [ CLUSTERED | NONCLUSTERED ] INDEX index_name ON { table | view } ( column [ ASC | DESC ] [ ,...n ] ) [ WITH < index_option > [ ,...n] ] [ ON filegroup ] < index_option > ::= { PAD_INDEX | ...
第六章 SQL命令 CREATE INDEX(一) 为表创建索引。 大纲 CREATE [UNIQUE | BITMAP | BITMAPEXTENT | BITSLICE ] INDEX index-name ON [TABLE] table-name (field-name, ...) [AS index-class-name [ (parameter-name = parameter_value, ... ) ] ] [WITH DATA (datafield-name, ...)] 参数 UN...
CREATE[UNIQUE|BITMAP|BITMAPEXTENT|BITSLICE]INDEXindex-nameON[TABLE]table-name(field-name,...)[ASindex-class-name[(parameter-name=parameter_value,...)]][WITHDATA(datafield-name,...)] 参数 UNIQUE- 可选的——一个约束,确保表中不会有两行索引中所有字段的值相同。不能为位图或位片索引指定此...
CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXISTS ] table_name { ({ column_name data_type [ compress_mode ] [ COLLATE collation ] [ column_constraint [ ... ] ] | table_constraint | LIKE source_table [ like_option [...] ] } [, ... ]...
CREATEINDEXidx_pnameONPersons(LastName,FirstName); DROP INDEX 语句 DROP INDEX语句用于删除表中的索引。 MS Access: 代码语言:sql AI代码解释 DROPINDEXindex_nameONtable_name; SQL Server: 代码语言:sql AI代码解释 DROPINDEXtable_name.index_name; ...