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: SQL>CREATE INDEX example_ndx ON myexample (mycola, UPPER(mycolb), mycolc); SQL>SELECT myc...
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 -...
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); SQL>SELECT mycolc FROM myexample 如何创建oracle函数...
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。
CREATE TABLE example( ID Number(4) NOT NULL PRIMARY KEY, NAME VARCHAR(25), PHONE VARCHAR(10), ADDRESS VARCHAR(50)); 如果对于以上的建表语句还有疑问的话,建议您不要继续了!有那么些时间您还不如去看看金庸读读琼瑶! 然后,你需要一个自定义的sequence ...
[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...
CREATE INDEX example, 1-28 example, 2-46 MULTI_LEXER type, 2-46 MULTI_STOPLIST type, 6-33 multi-language indexing, 6-19 multi-language stoplist, 2-46, 2-68 multi-language tables querying, 1-19, 2-47 N n_table_clause attribute, 2-63 narrower term operators example,...
create index toys_color_i on toys ( color );Simple, right?But, as always, there's more to it than that. You can place many columns in the same index. For example, you could also include the type of the toys in the index like so:Copy...
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_dd_lhr02.dbf';”来添加一个数据文件,然后再执行RECOVER并ONLINE后再用“ALTER TABLESPACE XXX DROP DATAFILE N;”命令删除。如果产生的日志文件以及丢失,那么...