Error trying to rename columns with space in oracle table. Error - SQL Error : ORA- 00946 : missing TO keyword
Error trying to rename columns with space in oracle table. Error - SQL Error : ORA- 00946 : missing TO keyword
我有 table 名为 employee。其中，我希望将列名从 Employee Name 更改为 Employee_Name（请注意，现有列名有一个 space！）
当我使用以下命令时：
Alter table employee rename column Employee Name to Employee_Name
我收到这个错误：
SQL Error : ORA- 00946 : missing TO keyword
如何解决这个问题？
由于 Oracle 不知道 space 是列名的一部分，因此您必须将其括在引号中以确保其正确识别：
Alter table employee rename column "Employee Name" to Employee_Name
I wish to alter the column name from 'Employee Name' to 'Employee_Name'
问题在于您在创建 table 时将 quoted identifier 用于 列名称 .
来自docs,
Database Object Naming Rules
Every database object has a name. In a SQL statement, you represent
the name of an object with a quoted identifier or a nonquoted
identifier.
A quoted identifier begins and ends with double quotation marks ("). If you name a schema object using a quoted identifier, then you
must use the double quotation marks whenever you refer to that object.
A nonquoted identifier is not surrounded by any punctuation.
您需要在现有列名周围使用双引号来解决问题：
SQL> CREATE TABLE employee("employee name" VARCHAR2(10));
Table created.
SQL> ALTER TABLE employee RENAME column "employee name" TO employee_name;
Table altered.
我有 table 名为 employee。其中，我希望将列名从 Employee Name 更改为 Employee_Name（请注意，现有列名有一个 space！）
当我使用以下命令时：
Alter table employee rename column Employee Name to Employee_Name
我收到这个错误：
SQL Error : ORA- 00946 : missing TO keyword
如何解决这个问题？
由于 Oracle 不知道 space 是列名的一部分，因此您必须将其括在引号中以确保其正确识别：
Alter table employee rename column "Employee Name" to Employee_Name
I wish to alter the column name from 'Employee Name' to 'Employee_Name'
问题在于您在创建 table 时将 quoted identifier 用于 列名称 .
来自docs,
Database Object Naming Rules
Every database object has a name. In a SQL statement, you represent the name of an object with a quoted identifier or a nonquoted identifier.
A quoted identifier begins and ends with double quotation marks ("). If you name a schema object using a quoted identifier, then you must use the double quotation marks whenever you refer to that object.
A nonquoted identifier is not surrounded by any punctuation.
您需要在现有列名周围使用双引号来解决问题：
SQL> CREATE TABLE employee("employee name" VARCHAR2(10));
Table created.
SQL> ALTER TABLE employee RENAME column "employee name" TO employee_name;
Table altered.