@@servername as servername, db_name() as databasename, s.name AS schemaname, t.name AS tablename, p.rows AS rowcounts, SUM(a.total_pages) * 8 AS totalspaceKB, SUM(a.used_pages) * 8 AS usedspaceKB, (SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS unusedspaceKB, ...
Creates a unique index on a table or view. A unique index is one in which no two rows are permitted to have the same index key value.The Database Engine doesn't allow creating a unique index on columns that already include duplicate values, whether or not IGNORE_DUP_KEY is set to ON...
查询计划中的联接顺序为 Table1、 Table2、 TableA、 TableB、 Table3。解析视图的索引与任何索引相同,仅当查询优化器确定在 SQL Server 的查询计划中使用索引视图有益时,SQL Server 才会选择这样做。索引视图可以在任何版本的 SQL Server 中创建。 在某些较早版本的 SQL Server 中,查询优化器会自动考虑索引视图...
WHERE Objectproperty(tables.object_id, N'TableHasClustIndex') = 0 )t where numberofrows is not null 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 查看表数据行数 但这种办法不是实时的,是sql server定时做的统计操作,执行下面代码可进一步精确 DBCC UpdateUSAGE(DatabaseName,[TABLENAME])WITH...
SQL>SELECT A.TABLE_NAME, A.NEXT_EXTENT, A.TABLESPACE_NAME FROM ALL_TABLES A,(SELECT TABLESPACE_NAME, MAX(BYTES) AS BIG_CHUNK FROM DBA_FREE_SPACE GROUP BY TABLESPACE_NAME ) F WHERE F.TABLESPACE_NAME = A.TABLESPACE_NAME AND A.NEXT_EXTENT > F.BIG_CHUNK ...
more info here http://www.sqlservertutorial.net/sql-server-string-functions/sql-server-string_split-function/ It creates a table from string. So, for each row in DB you will get a table. To Union it into one common table you have to use CROSS APPLY. SELECT VALUE, COUNT(*) FR...
GO SELECT * FROM TestBatch; -- Returns no rows. GO 在下列範例中,第三個 INSERT 陳述式會產生執行階段重複的主索引鍵錯誤。 前兩個 INSERT 陳述式會成功並且受到認可,因此它們在執行階段錯誤之後仍會保留。SQL 複製 CREATE TABLE TestBatch (ColA INT PRIMARY KEY, ColB CHAR(3)); GO...
In more detail, SQL Server creates the histogram from the sorted set of column values in three steps: Histogram initialization: In the first step, a sequence of values starting at the beginning of the sorted set is processed, and up to 200 values of range_high_key, equal_rows, range_rows...
IduCount 返回在应用程序使用提供程序启动并启用了统计信息之后,通过连接执行的 INSERT、DELETE 和 UPDATE 语句的总数。 IduRows 返回在应用程序使用提供程序启动并启用了统计信息之后,受通过连接执行的 INSERT、DELETE 和 UPDATE 语句影响的行的总数。 NetworkServerTime 返回在应用程序使用提供程序启动并启用了统计信息...
); Console.ReadKey(); } private static void DisplayData(System.Data.DataTable table) { foreach (System.Data.DataRow row in table.Rows) { foreach (System.Data.DataColumn col in table.Columns) { Console.WriteLine("{0} = {1}", col.ColumnName, row[col]); } Console.WriteLine("==...