SQL基础语法—create index语句 1 create index语句介绍 create index语句用来在表中创建索引。索引的作用提高数据库查询的效率,这个作用对用户来说是透明的,其作用只是对MySQL引擎来说的。 Syntax:CREATE[UNIQUE|FULLTEXT|SPATIAL] INDEX index_name [index_type]ONtbl_name (index_col_name,...) [index_option]...
] table_or_view_name } <backward_compatible_index_option> ::= { PAD_INDEX | FILLFACTOR = fillfactor | SORT_IN_TEMPDB | IGNORE_DUP_KEY | STATISTICS_NORECOMPUTE | DROP_EXISTING } Azure Synapse Analytics 和并行数据仓库的语法 syntaxsql 复制 CREATE CLUSTERED COLUMNSTORE INDEX index_name ON [...
SKAPA TABELL (Transact-SQL) Från och med SQL Server 2016 (13.x) kan du skapa en minnesoptimerad tabell med ett kolumnlagringsindex. Kolumnlagringsindexet kan också läggas till när tabellen har skapats med hjälp av syntaxen ALTER TABLE ADD INDEX. Läs in data i ett column...
Syntax for SQL Server, Azure SQL Database, and Azure SQL Managed Instance. syntaxsql Copy ALTER INDEX { index_name | ALL } ON { REBUILD { [ PARTITION = ALL [ WITH ( <rebuild_index_option> [ , ...n ] ) ] ] | [ PARTITION = partition_number [ WITH ( <single_partition_rebuild...
Syntax for SQL Server, Azure SQL Database, and Azure SQL Managed Instance. syntaxsql Copy ALTER INDEX { index_name | ALL } ON { REBUILD { [ PARTITION = ALL [ WITH ( <rebuild_index_option> [ , ...n ] ) ] ] | [ PARTITION = partition_number [ WITH ( <single_partition_rebuild...
Syntax CREATE [ UNIQUE ] INDEXindex ONtable(field[ASC|DESC][,field[ASC|DESC], ...]) [WITH { PRIMARY | DISALLOW NULL | IGNORE NULL }] The CREATE INDEX statement has these parts: Remarks To prohibit duplicate values in the indexed field or fields of different records, use the UNIQUE res...
Syntax CREATE [ UNIQUE ] INDEXindex ONtable(field[ASC|DESC][,field[ASC|DESC], ...]) [WITH { PRIMARY | DISALLOW NULL | IGNORE NULL }] The CREATE INDEX statement has these parts: Remarks To prohibit duplicate values in the indexed field or fields of different records, use the UNIQUE res...
#单表操作不支持 mysql> EXPLAIN DELETE FROM employees USE INDEX (PRIMARY) WHERE emp_no=10001; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'USE INDEX (PRIMARY) WHERE emp_no=1000...
SQL Server 和 Azure SQL 数据库的语法: syntaxsql复制 -- Create a clustered columnstore index on disk-based table.CREATECLUSTEREDCOLUMNSTOREINDEXindex_nameON{database_name.schema_name.table_name|schema_name.table_name|table_name} [ORDER(column [ , ...n ] ) ] [WITH(<with_option>[ , ......
Section 25.2.7.1, “Noncompliance with SQL Syntax in NDB Cluster” Section 17.12.1, “Online DDL Operations” Section 25.6.12, “Online Operations with ALTER TABLE in NDB Cluster” Section 10.4.1, “Optimizing Data Size” Section 10.5.7, “Optimizing InnoDB DDL Operations” Section 26.1, “Ov...