Add Index Syntax Sometimes after a table has been created in a database, we find that it is advantageous to add an index to that table to speed up queries involving this table (to understand what an index is and how it can help speed up SQL queries, please see the INDEX section). ...
syntaxsql 复制 CREATE [ UNIQUE ] [ CLUSTERED | NONCLUSTERED ] INDEX index_name ON ( column_name [ ASC | DESC ] [ ,...n ] ) [ WITH <backward_compatible_index_option> [ ,...n ] ] [ ON { filegroup_name | "default" } ] ::= { [ database_name. [ owner_name ] . ...
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_...
DROP INDEX- 删除索引 以下是一些常用的 SQL 语句和语法: SELECT:用于从数据库中查询数据。 SELECT column_name(s)FROM table_name WHERE condition ORDER BY column_name[ASC|DESC] column_name(s): 要查询的列。 table_name: 要查询的表。 condition: 查询条件(可选)。
syntaxsql 复制 ALTER FULLTEXT INDEX ON table_name { ENABLE | DISABLE | SET CHANGE_TRACKING [ = ] { MANUAL | AUTO | OFF } | ADD ( column_name [ TYPE COLUMN type_column_name ] [ LANGUAGE language_term ] [ STATISTICAL_SEMANTICS ] [ , ...n ] ) [ WITH NO POPULATION ] | ALTER...
syntaxsql复制 ALTERFULLTEXTINDEXONtable_name{ENABLE|DISABLE|SETCHANGE_TRACKING[ = ] {MANUAL|AUTO|OFF} |ADD(column_name[TYPECOLUMNtype_column_name] [LANGUAGElanguage_term] [STATISTICAL_SEMANTICS] [ , ...n ] ) [WITHNOPOPULATION] |ALTERCOLUMNcolumn_name{ADD|DROP}STATISTICAL_SEMANTICS[WITHNOPOPULAT...
syntaxsql ALTERDATABASEdatabase_name{<add_or_modify_files>|<add_or_modify_filegroups>}<add_or_modify_files>::={ADDFILE<filespec>[ ,...n ] [TOFILEGROUP{filegroup_name} ] |ADDLOGFILE<filespec>[ ,...n ] |REMOVEFILElogical_file_name|MODIFYFILE<filespec>}<filespec>::=(NAME=logical_file...
mysql> select id from users order by id desc limit 0,1 procedure analyse(extractvalue(rand(),concat(0x3a,version())),1);ERROR 1105 (HY000): XPATH syntax error: ':5.5.53' 图片 实战例子: 参数后and 1=2 判断,出现如红框所示and 1=2,1 ...
SQL_CU_INDEX_DEFINITION = 所有索引定义语句都支持目录: CREATE INDEX 和DROP INDEX。SQL_CU_PRIVILEGE_DEFINITION = 所有特权定义语句都支持目录: GRANT 和REVOKE。如果数据源不支持目录,则返回值 0。 若要确定是否支持目录,应用程序使用SQL_CATALOG_NAME信息类型调用 SQLGetInfo。 SQL-92 完全一致性驱动程序将...