create [or replace] function function_name(param_list) returns return_type language plpgsql as $$ declare -- variable declaration begin -- logic end; $$; In this syntax: First, specify the name of the function after the create function keywords. To replace the existing function, use the or...
PostgreSQL allows functionoverloading; that is, the same name can be used for several different functions so long as they have distinct input argument types. Whether or not you use it, this capability entails security precautions when calling functions in databases where some users mistrust other ...
Btree index is most popular and fairly used in PostgreSQL while creating an index. Btree index will create a tree and stores data in a node; the node can be a variable number. The below example shows the Btree index are as follows: Example: testing=#CREATE INDEX CONCURRENTLY cust_id_index...
In PostgreSQL, the database objects are created using the CREATE command. In this write-up, we will discuss how to use the Postgres “CREATE” command for Table, View, Sequence, INDEX, Function, and Tablespace Creation. Case 1: Use the CREATE Command For Table Creation Tables are among th...
SET VARIABLE SYNC CACHE (Azure Databricks 上的 Delta Lake) 「CLONE」(Azure Databricks 上的 Delta Lake) CONVERT TO DELTA (Azure Databricks 上的 Delta Lake) COPY INTO (Azure Databricks 上的 Delta Lake) 在Azure Databricks 上的 Delta Lake 中創建布隆過濾器索引 DELETE FROM (Azure Databricks...
* 通常这个操作在第一次调用RecoveryInProgress()或 LocalSetXLogInsertAllowed()时已完成,然而在创建end-of-recovery checkpoint时,LocalSetXLogInsertAllowed 会在下面的临界区中完成调用,但InitXLogInsert不能在临界区中调用。 */ InitXLogInsert(); /* ...
创建一个函数。如果创建函数时参数或返回值带有精度,不进行精度检测。创建函数时,函数定义中对表对象的操作建议都显式指定模式,否则可能会导致函数执行异常。在创建函数时,函数内部通过SET语句设置current_schema和search_path无效。执行完函数search_path和current_sch
当集群为 PolarDB PostgreSQL 版(兼容 Oracle)或 PolarDB PostgreSQL 版时,该参数必填;当集群为 PolarDB MySQL 版时,该参数非必填。 testdesc AccountName string 否 授权访问该数据库的账号名。可通过接口 DescribeAccounts 查询账号信息。 说明 只支持输入普通账号,高权限账号默认拥有数据库全部权限无需授权。 当集群...
当集群为 PolarDB PostgreSQL 版(兼容 Oracle)或 PolarDB PostgreSQL 版时,该参数必填;当集群为 PolarDB MySQL 版时,该参数非必填。 testdesc AccountName string 否 授权访问该数据库的账号名。可通过接口 DescribeAccounts 查询账号信息。 说明 只支持输入普通账号,高权限账号默认拥有数据库全部权限无需授权。 当集群...
Creates a function.If the parameters or return values of a function have precision, the precision is not checked.When creating a function, you are advised to explicitly s