The following example creates an index on both last name and first name columns: CREATEINDEXmembers_name_iONmembers(last_name,first_name);Code language:SQL (Structured Query Language)(sql) The following query finds members whose last name starts with the letterAand first name starts with the let...
SQL>CREATE INDEX expression_ndx ON mytable ((mycola + mycolc) * mycolb); SQL>SELECT mycolc FROM mytable WHERE (mycola + mycolc) * mycolb 1. 2. 3. 4. 5. 6. 7. 8. 复合索引的例子: AI检测代码解析 SQL>CREATE INDEX example_ndx ON myexample (mycola, UPPER(mycolb), mycolc); ...
INSERT INTO mytable VALUES(111556,'this is a direct_datastore example'); Commit; CREATE INDEX myindex ON mytable(docs) indextype IS ctxsys.context parameters ('datastore ctxsys.default_datastore'); SELECT * FROM mytable WHERE contains(docs, 'text') > 0; --- oracle 全文索引 -...
若使用了“ALTER DATABASE DATAFILE N OFFLINE DROP;”命令,则并不会删除数据文件,这个时候可以先ONLINE后再用“ALTER TABLESPACE XXX DROP DATAFILE N;”删除。如果执行“ALTER DATABASE DATAFILE N OFFLINE DROP;”后并在OS级别删除了数据文件,那么首先需要使用“ALTER DATABASE CREATE DATAFILE N AS '/tmp/ts_d...
[NOTE:77523.1] Transportable Tablespaces — An Example to setup and use. [NOTE:100698.1] Perform tablespace point-in-time recovery using Transportable Tablespace. 在进行并行EXP/IMP的时候,假设IMP过程建索引的话不建议同一时候执行5个以上的IMP,假设你想加高速度,能够在IMP的时候不建索引,这样仅仅要内存同意...
SQL>CREATE INDEX expression_ndx ON mytable ((mycola + mycolc) * mycolb); SQL>SELECT mycolc FROM mytable WHERE (mycola + mycolc) * mycolb 复合索引的例子: SQL>CREATE INDEX example_ndx ON myexample (mycola, UPPER(mycolb), mycolc); ...
Getting started guides, documentation, tutorials, architectures, and more content for Oracle products and services.
Temporary tablesare useful in applications where a result set is to be buffered (temporarily persisted), perhaps because it is constructed by running multiple DML operations. For example, consider the following: A Web-based airlines reservations application allows a customer to create several optional...
example: /*创建一般索引*/ create index index_name on table_name(column_name) tablespace tablespace_name; /*创建位图索引*/ create bitmap index index_name on table_name(column_name1,column_name2) tablespace tablespace_name; /*索引中不能用pctused*/ create [bitmap] index index_name on table...
若数据库版本大于等于 12.2.0.1 时,在创建非 cdb 或包含至少一个 pdb 的 cdb 数据库时,会创建示例数据库,但是相关的示例数据位于 SYSAUX 表空间。若数据库版本小于 12.2.0.1 时,则示例数据位于 EXAMPLE 表空间。 12c 版本的 CDB 数据库不再包含示例数据库和示例表空间。