--https://msdn.microsoft.com/en-us/library/ms180047.aspx --https://msdn.microsoft.com/zh-cn/library/ms180047(v=sql.120).aspx --https://msdn.microsoft.com/zh-cn/library/ms179853(v=sql.120).aspx --为表添加描述信息 EXECUTEsp_addextendedproperty N'MS_Description','导入员工资料表', N'...
[ OPERATION_TYPE_DESC_COLUMN_NAME = operation_type_desc_column_name ] } <table_stretch_options> ::= { [ FILTER_PREDICATE = { NULL | table_predicate_function } , ] MIGRATION_STATE = { OUTBOUND | INBOUND | PAUSED } } <index_option> ::= { PAD_INDEX = { ON | OFF } | FILLFACTOR...
[ ASC | DESC ] [ ,... n ]) | NONCLUSTERED HASH (column [ ,... n ] ) WITH ( BUCKET_COUNT = bucket_count ) } | FOREIGN KEY ( column [ ,...n ] ) REFERENCES referenced_table_name [ ( ref_column [ ,...n ] ) ] | CHECK ( logical_expression ) } <column_index> ::= ...
desc table表名和desc加表名的区别 desc表名 显示内容,一、数据库建模二、建表三、数据库字典四、DML语句五、视图六、索引七、序列八、DDL语句 Lesson8OverviewofDataModelingandDatabaseDesign---
{ DESC | DESCRIBE } [ TABLE ] [ EXTENDED ] table_name { [ PARTITION clause ] | [ column_name ] } [ AS JSON ] 为了兼容性,FORMATTED可以作为EXTENDED的同义词。 EXTENDED 如果指定了该参数,则显示有关指定列的详细信息,包括命令收集的列统计信息和其他元数据(例如架构限定符、所有者和访问时间)。
SQL DESC statement use for describe the list of column definitions for specified table. You can use either DESC or DESCRIBE statement. both are return same result.
[ ASC | DESC ] [ ,... n ]) | NONCLUSTERED HASH (column [ ,... n ] ) WITH ( BUCKET_COUNT = bucket_count ) } | FOREIGN KEY ( column [ ,...n ] ) REFERENCES referenced_table_name [ ( ref_column [ ,...n ] ) ] | CHECK ( logical_expression ) } <column_index> ::= ...
排序函数: order by (默认 asc 升序,指定 desc 降序),例如将表格数据按照考试成绩从低到高排序。 排名函数: rank, dense rank, row number,得到的成绩的排序后,根据成绩的高低对学生排名, 100 分对应第一名,99 分第二名。它们的区别在于: row number: 根据成绩排序生成连续的序列号,1,2,3,4…… ...
ORDER BY Rate DESC Besides, there’s no derived table, CTE or temporary table, just joins. And it gives the same results. And it’s also simpler. But check the logical reads below: It’s a lot worse than using temporary tables. The Department and Person tables have high logica...
[reference_definition] } data_type: (see Chapter 11, Data Types) key_part: col_name [(length)] [ASC | DESC] index_type: USING {BTREE | HASH} index_option: { KEY_BLOCK_SIZE [=] value | index_type | WITH PARSER parser_name | COMMENT 'string' } reference_definition: REFERENCES tbl...