See also:list of all primary keys (one row per PK). Query selectschema_name(tab.schema_id)as[schema_name], pk.[name]aspk_name, ic.index_column_idascolumn_id, col.[name]ascolumn_name, tab.[name]astable_namefromsys.tables tabinnerjoinsys.indexes pkontab.object_id = pk.object_idand...
SQL 複製 CREATE TABLE TestBatch (ColA INT PRIMARY KEY, ColB CHAR(3)); GO INSERT INTO TestBatch VALUES (1, 'aaa'); INSERT INTO TestBatch VALUES (2, 'bbb'); INSERT INTO TestBatch VALUSE (3, 'ccc'); -- Syntax error. GO SELECT * FROM TestBatch; -- Returns no rows....
[PRIMARY]); GO CREATE TABLE fact_sales(date_id int, product_id int, store_id int, quantity int, unit_price numeric(7,2), other_data char(1000)) ON ps_fact_sales(date_id); GO CREATE CLUSTERED INDEX ci ON fact_sales(date_id); GO PRINT 'Loading...'; SET NOCOUNT ON; DECLARE @...
.DateTime) tab1.Columns.Add(col3) ' Create the ftable tab1.Create() ' Define Index object on the table by supplying the Table1 as the parent table and the primary key name in the constructor. Dim pk As New Index(tab1, "Table1_PK") pk.IndexKeyType = IndexKeyType.DriPrimaryKey '...
CREATETABLEOrg_T3 ( EmployeeId HIERARCHYID PRIMARYKEY, ParentIdASEmployeeId.GetAncestor(1) PERSISTEDREFERENCESOrg_T3(EmployeeId), LastChild HIERARCHYID, EmployeeNameNVARCHAR(50) ); GO 当用于维护层次结构树的不可信代码对表拥有直接 DML 访问权限时,将优先采用这种强制关系的方法。 但是,这种方法可能会降低性...
The SQLPrimaryKeys() function returns a list of column names that comprise the primary key for a table.
If Order By isn't specified, primary keys or unique keys are used by SQL Server by default. Non-deterministic results might cause issues, such as duplicating records in the action output when pagination is enabled. SQL views don't support primary key, which is the limitation from SQL Server...
以下示例使示例 B 中创建的Test1FG1文件组成为默认文件组。 然后,默认文件组被重置为PRIMARY文件组。 请注意,必须使用括号或引号分隔PRIMARY。 SQL USEmaster; GOALTERDATABASEAdventureWorks2022MODIFYFILEGROUP Test1FG1DEFAULT; GOALTERDATABASEAdventureWorks2022MODIFYFILEGROUP [PRIMARY]DEFAULT; GO ...
ALL 扫描全表数据 index 遍历索引 range 索引范围查找 index_subquery 在子查询中使用 ref unique_subquery 在子查询中使用 eq_ref ref_or_null 对Null进行索引的优化的 ref fulltext 使用全文索引 ref 使用非唯一索引查找数据 eq_ref 在join查询中使用PRIMARY KEYorUNIQUE NOT NULL索引关联。 possible_keys 可能...
Copy table from one server to another Copy table Structure including primary keys, index etc. Copy tables with all constraints Correct way to run multiple sql scripts from one 'master' script? with logs etc. Could #TempTable within SP cause lock on tempdb? Could not complete cursor operation...