ALTER TABLE [ IF EXISTS ] { table_name [*] | ONLY table_name | ONLY ( table_name ) } action [, ... ]; There are several clauses of action: column_clause | ADD table_constraint [ NOT VALID ] | ADD table_constr
AND table_name = 'DELIVERY_ORDERS'; IF (v_col_exists = 0) THEN EXECUTE IMMEDIATE 'ALTER TABLE delivery_orders ADD status NUMBER'; ELSE DBMS_OUTPUT.PUT_LINE('The delivery_orders table already has the column status.'); END IF; END; /Code language: SQL (Structured Query Language) (sql)...
更改column_name 列的说明。 comment 必须为 STRING 文本。 FIRST 或AFTER 标识符 将列从当前位置移到前面(FIRST)或紧邻 AFTER 之后(identifier)。只有 table_name 为Delta 表时才支持此子句。 TYPE data_type 适用于 Databricks SQL Databricks Runtime 15.2 及更高版本 更改column_name 列的数据类型...
To determine the current compatibility level, query thecompatibility_levelcolumn ofsys.databases. SQL SELECT[name], compatibility_levelFROMsys.databases; To determine the version of the Database Engine that you're connected to, execute the following query. ...
To determine the current compatibility level, query thecompatibility_levelcolumn ofsys.databases. SQL SELECT[name], compatibility_levelFROMsys.databases; To determine the version of the Database Engine that you're connected to, execute the following query. ...
Specify a column at which to divide an index-organized table row into index and overflow portions. The primary key columns are always stored in the index. column_name can be either the last primary-key column or any non-primary-key column. All non-primary-key columns that follow column_...
AnALTER TABLEstatement that changes the default value of a columncol_namemay also change the value of a generated column expression that refers to the column usingcol_name, which may change the value of a generated column expression that refers to the column usingDEFAULT(col_name). For this ...
SQL SELECT[name], compatibility_levelFROMsys.databases; 若要确定连接到的数据库引擎版本,请执行以下查询。 SQL SELECTSERVERPROPERTY('ProductVersion'); 兼容性级别和数据库引擎升级 数据库兼容性级别是一个重要的工具,可通过允许升级 SQL Server 数据库引擎,同时通过维持相同的升级前数据库兼容性级别保持连接应用程...
You must fully specify each filename according to the conventions of your operating system. ADD SUPPLEMENTAL LOG DATA Clause Specify the ADD SUPPLEMENTAL LOG DATA clause to place additional column data into the log stream any time an update operation is performed. This information can be used ...
cust_name varchar2(100) not null, cust_hair_color varchar2(20) ) ; 1. 2. 3. 4. 5. We can also use Oracle "alter table" syntax in dynamic PL/SQL to modify data columns BEGIN SQL_STRING := 'ALTER TABLE '||:TABLE_NAME||' MODIFY '||:COLUMN_NAME||' VARCHAR2(100)'; ...