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
Truncate the data in a partition. ALTER TABLE [ IF EXISTS ] { [ ONLY ] [[database_name.]schema_name.]table_name | table_name * | ONLY ( table_name ) } TRUNCATE PARTITION { partition_name | FOR ( partition_value [, ...] ) } ; Parameter Description ONLY If ONLY is specified...
14.10.3 SQL Syntax for Online DDL 在线DDL SQL语法 通常情况下, 你不需要做任何事情来启用在线DDL, 当使用ALTER TABLE 语句。 See Table 14.6, “Summary of Online Status for DDL Operations” 对于DDL操作的类型 允许并发的DML, 一些变化需要特定配置的组或者ALTER TABLE 子句 你可以控制特定在线DDL操作的各...
A SQL statement takes the general form: SELECT field_1 FROM table_1 WHERE criterion_1 ; Notes: Access ignores line breaks in a SQL statement. However, consider using a line for each clause to help improve the readability of your SQL statements for yourself and others. ...
Obs!: SQL används inte bara för att hantera data, utan också för att skapa och ändra designen för databasobjekt som tabeller. Den del av SQL som används för att skapa och ändra databasobjekt kallas DDL (data definition language). Det hä...
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...
This REPLACE function in SQL is powerful for manipulating strings to locate a certain substring in the string that will be searched to replace another substring. In general, it can prove useful when cleaning and updating textual data in a database. In particular, it operates case-insensitively...
ALTER TABLE ... REORGANIZE PARTITION Section 25.6.7.3, “Adding NDB Cluster Data Nodes Online: Detailed Example” Section 25.6.7.1, “Adding NDB Cluster Data Nodes Online: General Issues” Section 25.6.1, “Commands in the NDB Cluster Management Client”...
SQL Server Yukon Beta 1 introduces the new TRY/CATCH construct for error handling in T-SQL. This construct allows you to trap transaction abort errors, even those that would have caused a batch to terminate in previous versions of SQL Server (conversion errors, deadlocks, and so on). The ...
REORGANIZE PARTITION Section 25.6.7.3, “Adding NDB Cluster Data Nodes Online: Detailed Example” Section 25.6.7.1, “Adding NDB Cluster Data Nodes Online: General Issues” Section 25.6.1, “Commands in the NDB Cluster Management Client” Section 3.6, “Preparing Your Installation for Upgrade”...