Add a new column to table with theALTER TABLE… ADDstatement. Set the column properties in the same command itself. As an example, add columnc1of data typeINTwith default value of1. Set the column as non-nullable with theNOT NULLclause. Set thec1column as the primary key with thePRIMARY...
ADD column_name datatype [DEFAULT default_value] [NULL|NOT NULL] [CONSTRAINT constraint_name] [column_constraint_clause]; Swap table_name with the table’s name to which you wish to add the column(s). The column_name specifies the name of the column you wish to add to the table. This...
ALTER TABLE table_name ADD column_name data_type constraint; Code language: SQL (Structured Query Language) (sql) In this statement: First, you specify the name of the table, to which you want to add the new column, after the ALTER TABLE clause. Second, you specify the column name, dat...
importTable(ImportTool.java:482) at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:646) at org.apache.sqoop.Sqoop.run(Sqoop.java:143) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70) at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:179) at org.apache.sqoop.Sqoop.runTool(...
addressvarchar2(100)--学生的地址);--SQL语句结束 我们添加一个 英文状态下的;--添加字段ALTERTABLEt_studentADDgenderchar(3);--修改字段类型ALTERTABLEt_studentMODIFYgendervarchar2(3);--修改字段名称ALTERTABLEt_studentRENAMECOLUMNgender to sex;--删除字段ALTERTABLEt_studentDROPCOLUMNsex; ...
Oracle 11g R2 alter table add column Oracle官方文档中关于alter table add column有下面的描述 https://docs.oracle.com/cd/E11882_01/server.112/e25494/tables.htm#ADMIN11005 个人理解纯粹是添加新列带有默认值的,如果不带默认值的,应该非常快就完成了。之前生成库160G的表,添加新列不到1秒就完成。
mysql> use test; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> show tables; +---+ | Tables_in_test | +---+ | T_DEPT | | T_PERSON | +---+ 2 rows in set (0.00 sec)...
fromuser=user1 touser=user2导入时切换用户(在ignore=y不生效时可使用) tables=(tab1,tab2)导出指定表 QUERY=\"WHERE rownum<11\"在tables()后面跟上导出部分数据 SQL语法 DML数据操作语言 基本功能 增删改查 insert into table_name (column1,column2,column3) values (1,2,3);--插入数据 ...
Split table big data self-processing Support Multi-tenant, multi-library transactions Support CodeFirst data migration. Support Join query 、 Union all 、 Subquery Support Configure the query Support DbFirst import entity class from database, or use Generation Tool. ...
oracleReaderQuery使用自定义 SQL 查询读取数据。 例如"SELECT * FROM MyTable"。 启用分区加载时,需要在查询中挂接任何相应的内置分区参数。 有关示例,请参阅从 Oracle 进行并行复制部分。否 convertDecimalToInteger使用零标度或未指定标度的 Oracle NUMBER 类型将转换为相应的整数。 允许的值为true和true(默认值)...