CREATE [ UNIQUE ] [ CLUSTERED | NONCLUSTERED ] INDEX index_name ON { table | view } ( column [ ASC | DESC ] [ ,...n ] ) [ WITH < index_option > [ ,...n] ] [ ON filegroup ] < index_option > ::= { PAD_INDEX | FILLFACTOR = fillfactor | IGNORE_DUP_KEY | DROP_EXISTIN...
import pandas as pdpd.set_option('display.width', 300) # 设置字符显示宽度pd.set_option('display.max_rows', None) # 设置显示最大行pd.set_option('display.max_columns', None)data = pd.read_csv('Nowcoder.csv')print(data.query("Language == 'CPP' & Level == 7 & Graduate_year != ...
CREATE INDEX enables you to add indexes to existing tables. CREATE INDEX is mapped to an ALTER TABLE statement to create indexes. See Section 15.1.9, “ALTER TABLE Statement”. CREATE INDEX cannot be used to create a PRIMARY KEY; use ALTER TABLE instead. For more information about indexes...
A. CREATE TABLE B. CREATE INDEX C. CREATE VIEW D. INDEX ON 相关知识点: 试题来源: 解析 B 正确答案:B解析:SQL定义功能中,利用CREATE INDEX命令可以建立表的索引,选项A)定义一个新表,选项C)定义一个视图,选项D)可以为表建立索引,但不属于SQL语句。反馈...
I have a problem with creation of index on very large table. Has anybody had an experience with this? I have created a large table (600M row) and need to create a multi-column index. I am having problem creating index. It seems like process get stuck after while. Data is being loade...
}index_type: USING {BTREE | HASH}algorithm_option: ALGORITHM [=] {DEFAULT | INPLACE | COPY}lock_option: LOCK [=] {DEFAULT | NONE | SHARED | EXCLUSIVE} Normally, you create all indexes on a table at the time the table itself is created withCREATE TABLE. SeeSection 15.1.20, “CREATE...
CREATE CLUSTERED COLUMNSTORE INDEX index_name ON [ database_name . [ schema ] . | schema . ] table_name [ORDER (column[,...n])] [WITH ( DROP_EXISTING = { ON | OFF } )] [;] CREATE [ CLUSTERED | NONCLUSTERED ] INDEX index_name ON [ database_name . [ schema ] . | schema...
CREATE CLUSTERED COLUMNSTORE INDEX index_name ON [ database_name . [ schema ] . | schema . ] table_name [ORDER (column[,...n])] [WITH ( DROP_EXISTING = { ON | OFF } )] [;] CREATE [ CLUSTERED | NONCLUSTERED ] INDEX index_name ON [ database_name . [ schema ] . | schema...
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. A clustered index on a view must be unique. The Database Engine does not allow creating a unique index on columns that already include duplicate values...
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...