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...
ALTER TABLE PARTITION modifies table partitions, including adding, deleting, splitting, merging, clearing, swapping, and renaming partitions, moving partition tablespaces
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....
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
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...
and clear outdated table structures from the table and table definition caches. At this point, it must acquire an exclusive lock. To do so, it waits for current readers to finish, and blocks new reads (and writes).】,但对表的更新、写、删操作会阻塞直到新表准备完毕,原表的临时备份是在新...
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.
SQL CREATE INDEX Statement To create an index on a database table, SQL provides the CREATE INDEX statement. Following is the syntax − CREATEUNIQUEINDEXindex_nameONtable_name(column1,column2,...columnN); Let us create an index for the column named 'NAME' in the existing CUSTOMERS table ...
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:...
Msg 102, Level 15, State 1, Line 7 Incorrect syntax near 'RENAME'. This above error keeps occurring as I try to rename a column in my table syntax ALTER TABLE Project RENAME COLUMN ProjectNO to Project_NO;