在Microsoft SQLJet (和 Microsoft Access)中的语法是这样的: DROP INDEX index_name ON table_name Syntax for MS SQL Server: MS SQL Server的语法是这样: DROP INDEX table_name.index_name Syntax for IBM DB2 and Oracle: IBM DB2和
D Oracle Regular Expression Support E Oracle SQL Reserved Words and Keywords F Extended Examples Index Purpose Use theDROPINDEXstatement to remove an index or domain index from the database. When you drop a global partitioned index, a range-partitioned index, or a hash-partitioned index, all...
Assume we want to drop the index created in the ALTER TABLE ADD INDEX section. To do this, we type in the following: ALTER TABLE Customer DROP INDEX IDX_COUNTRY;Please note that using ALTER TABLE to drop an index in supported in MySQL but not in Oracle or SQL Server....
directory_name Name of the directory object. path_name The operating system directory's full case-sensitive pathname. Oracle does not check to see if the directory actually exists on the host operating system, so be sure to check the path you provide carefully. ...
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drop语句将删除表的结构被依赖的约束(constrain),触发器(trigger),索引(index); delete/drop可以删除视图,索引,触发器等,truncate只针对表。 3.高水位HWM delete语句不影响表所占用的区(Extent), 高水线保持原位置不动。 drop语句将表所占用的空间全部释放。
Oracle/ Oracle Database/ Release 23 Spatial Developer's Guide Syntax DROP INDEX [schema.]index [FORCE]; Purpose Deletes a spatial index. Keywords and Parameters ValueDescription FORCE Causes the spatial index to be deleted from the system tables even if the index is marked in-progress or some...
One more parameter used in the CREATE INDEX statement is COMPUTE STATISTICS. It is an optional parameter telling Oracle to collect the statistics during index creation. Further, this stats data would serve when choosing the “plan of execution” of SQL statements. However, since Oracle 10, the ...
311 312 CHANGE col_name、DROP col_name 和 DROP INDEX 是MySQL 对 ANSI SQL92 的扩展。 313 314 MODIFY is an Oracle extension to ALTER TABLE. 315 可选词 COLUMN 只是一个无用词组,可被忽略。 316 317 如果你使用 ALTER TABLE tbl_name RENAME TO new_name,并没有任何其它的选项,MySQL 将简单地重...
SQL> drop index "SYS_AI_600vgjmtqsgv3"; drop index "SYS_AI_600vgjmtqsgv3" * ERROR at line 1: ORA-65532: cannot alter or drop automatically created indexes Although as discussed in my last post, you can now drop Automatic Indexes by using DBMS_AUTO_INDEX.DROP_AUTO_INDEXES. You can ...