For more information, see SET QUOTED_IDENTIFIER (Transact-SQL). CREATE [NONCLUSTERED] COLUMNSTORE INDEX Create a nonclustered columnstore index on a rowstore table stored as a heap or clustered index. The index can have a filtered condition, and doesn't need to include all of the columns of...
CREATE SPATIAL INDEX CREATE STATISTICS CREATE TABLE CREATE XML INDEX Data types (資料類型) DBCC SHOW_STATISTICS DROP INDEX XML 索引 (SQL Server) sys.indexes sys.index_columns sys.xml_indexes EVENTDATA意見反應 此頁面對您有幫助嗎? Yes No 提供產品意見反應 | 在Microsoft Q&A 上取得說明 其他...
('public.src_table', 'dictionary_encoding_columns', 'b:auto'); CALL SET_TABLE_PROPERTY('public.src_table', 'time_to_live_in_seconds', '3153600000'); CALL SET_TABLE_PROPERTY('public.src_table', 'distribution_key', 'a'); CALL SET_TABLE_PROPERTY('public.src_table', 'storage_format'...
用户可以查询column_store_order_ordinal表中排序的列sys.index_columns或列以及排序顺序中的序列。 有关详细信息,请查看使用有序聚集列存储索引进行性能调整。 数据类型 Azure Synapse Analytics 支持最常用的数据类型。 要更好地理解数据类型以及如何使用它们,请参阅Azure Synapse Analytics 中表的数据类型。
180 181 最大记录的字节长度可以按下面的计算得出: 182 row length = 1 183 + (sum of column lengths) 184 + (number of NULL columns + 7)/8 185 + (number of variable-length columns) 186 187 table_options 和 SELECT 选项只在 MySQL 3.23 和以后的版本中被实现。 不同的表类型为: 188 189 ...
and Foreign Key (FK) constraintin SQL Server helps to enforce data integrity between tables. In simple words, FK is a column or a combination of columns in one table referencing the Primary Key of another table, thereby, it ensures that value in one table must be present in another table...
columnN datatype,PRIMARYKEY(oneormore columns ) ); 写法1: test=#createtablecompany(idintprimarykeynotnull, name textnotnull, ageintnotnull,addresschar(50) , salaryreal); 写法2: test=#CREATETABLECOMPANY( test(# IDINTPRIMARYKEYNOTNULL, ...
Here, the SQL command checks if a table namedCompaniesexists, and if not, it creates a table with specified columns. Create Table Using Another Existing Table In SQL, we can create a new table by duplicating an existing table's structure. ...
Specify an expression built from columns of table, constants, SQL functions, and user-defined functions. When you specify column_expression, you create a function-based index.See Also: "Notes on Function-Based Indexes:", "Restrictions on function-based indexes:", and "Function-Based Index ...
以下CREATE TABLE 语句定义的表提供了一个使用 LIST COLUMNS 分区的示例: 1. CREATE TABLE lc ( 2. a INT NULL, 3. b INT NULL 4. ) 5. PARTITION BY LIST COLUMNS(a,b) ( 6. PARTITION p0 VALUES IN( (0,0), (NULL,NULL) ), 7. PARTITION p1 VALUES IN( (0,1), (0,2), (0,3), ...