The SQL CREATE TABLE command is used to create a database table. It can be used to create different types of database tables, such astemporary tables. However, in this article, I’ll only cover the regular database table. SQL Create Table Syntax The syntax for the SQL create table state...
2.RENAME TABLE Syntax 修改表的名称 RENAME TABLE old_table TO new_table; That statement is equivalent to the following ALTER TABLE statement等同: ALTER TABLE old_table RENAME new_table; 1 2 3 4 Data Manipulation Statements(数据操作语法) 1.INSERT Syntax 从现有表筛选数据插入到另一个表中 语法:...
You can rename a table or a column temporarily by giving another name, which is known as ALIAS. The use of table aliases means to rename a table in a particular PostgreSQL statement. Renaming is a temporary change and the actual table name does not change in the database....
In this page, we list the SQL syntax for each of the SQL commands in this tutorial, making this an easy reference for someone to learn SQL. For detailed explanations of each SQL syntax, please go to the individual section by clicking on the keyword.The...
Look up any Oracle SQL keyword, PL/SQL keyword, PL/SQL built-in package or procedure, or SQL*Plus keyword. Jump to the definition or search for examples.
当在修改表时仍可读【会报异常,在修改中也会阻止读ALTER TABLEblocks reads (not just writes) at the point where it is ready to install a new version of the table.frmfile, discard the old file, and clear outdated table structures from the table and table definition caches. At this point, ...
Data definition language (DDL) is used to define or modify an object in a database, such as a table, index, or view.GaussDB(DWS) does not support DDL if its CN is unavail
You can rename a table or a column in a database temporarily by giving them another pseudo name. This pseudo name is known as Alias. The use of aliases is to address a specific table or a column in an SQL statement without changing their original name in the database. Aliases are ...
CREATE/ALTER/RENAME/DROP TABLE Partially supported Temporary session tables cannot be restored. DDL CREATE/ALTER/DROP TABLE PARTITION/SUBPARTITION Supported - DDL CREATE/ALTER/DROP INDEX Partially supported The ALTER INDEX REBUILD option is equivalent to REINDEX and is not supported currently. DD...
select * from testobstable where external_data = '22'; select * from testobstable where external_data = '22' and dt='2021-07-27'; 1.9.2 Renaming a Partition (Only OBS Tables Supported) Function This statement is used to rename partitions. Issue 01 (2022-08-16) Copyright © Huawei...