对于临时表,CREATE INDEX始终是非并发的,因为没有其他会话可以访问它们,并且创建非并发索引的成本更低。 IF NOT EXISTS如果一个同名关系已经存在则不要抛出错误。这种情况下会发出一个提示。 这并不保证现有的索引与将要创建的索引有任何相似。当 IF NOT EXISTS被指定时,需要指定索引名。 INCLUDE可选的INCLUDE子句指...
Check out https://www.jooq.org/javadoc/latest/org.jooq/org/jooq/impl/DSL.html#createIndexIfNotExists() The annotation there says: @Support({AURORA_POSTGRES,COCKROACHDB,DB2,FIREBIRD,H2,HANA,HSQLDB,IGNITE,INFORMIX,MARIADB,ORACLE,POSTGRES,SQLDATAWAREHOUSE,SQLITE,SQLSERVER,SYBASE}) So, this isn't ...
Caused by: Error : 955, Position : 19, Sql = CREATE INDEX ADMIN."index_-id" ON ADMIN.test_table(name), OriginalSql = CREATE INDEX ADMIN."index_-id" ON ADMIN.test_table(name), Error Msg = ORA-00955: name is already used by an existing object at oracle.jdbc.driver.T4CTTIoer11.pr...
Oracle Database supports several types of index: Normal indexes. (By default, Oracle Database creates B-tree indexes.) Bitmap indexes, which store rowids associated with a key value as a bitmap. Partitioned indexes, which consist of partitions containing an entry for each value that appears...
CREATE TABLE [IF NOT EXISTS] [namespace:]table-name[COMMENT "comment string"] (field-definition,field-definition-2[,...] PRIMARY KEY (field-name,field-name-2[,...] ), ) [USING TTLttl] [IN REGIONSregion-name,region-name-2[,...]] ...
这是对SQL-92标准的两种可能的解释之一(标准中的语言是不明确的),PostgreSQL,MySQL,Firebird和Oracle的解释是其中之一。Informix和Microsoft SQL Server遵循标准的其他解释。 如果存在可选的IF NOT EXISTS子句并且存在另一个具有相同名称的索引,则该命令将变为空操作。 使用DROP INDEX命令删除索引。
CREATETABLE[IFNOTEXISTS]table_name(table_definition_list)[table_option_list][partition_option][AS]select;CREATETABLE[IFNOTEXISTS]table_nameLIKEtable_name;table_definition_list: table_definition[,table_definition...]table_definition: column_definition|[CONSTRAINT[constraint_name]]PRIMARYKEYindex_desc|[...
In its turn, a B-Tree Index is divided into: Normal Index.It is the most common type created if a user does not specify any additional parameters. In particular, Oracle creates it automatically for the primary key column whenever you create a new table with the primary key. ...
Create index IF NOT EXISTS idx on tb(a); Create sequence IF NOT EXISTS sqc; Create schema IF NOT EXISTS schm; openGauss 中很多语法暂时不支持 if not exists 判断,因此在转换时会给删掉。 如: Create schema IF NOT EXISTS schm; => Create schema schm; ...