亲测plsql可用。 mysql: 表名:channel_product 列名:EXCHANGE_CODE DROPPROCEDUREIFEXISTSadd_column_channel_product;CREATEPROCEDUREadd_column_channel_product()BEGINIFNOTEXISTS(SELECT1FROMinformation_schema.columnsWHEREtable_name='channel_product'ANDcolumn_name='EXCHANGE_CODE')THENALTERTABLEchannel_productADDCOL...
4:直接PLSQL 使用重建表(不推荐) 注意:重建表功能相当于 清掉所有数据 ,触发器,外键都会被清空,速度会很慢 ,效率并不是很好。
IF (v_cnt=0)THENEXECUTEimmediate'ALTER TABLE "ACT"."TEMPPHYSICALOPACCOUNTLIST" ADD "ISDUPLICATEREMOVAL1" NUMBER(1,0) DEFAULT 0';ENDif;END;/DECLAREv_cnt number(10,0);BEGINSELECTcount(1)INTOv_cntFROMdba_tab_columns cWHEREc.owner='ACT'ANDTABLE_NAME='TEMPPHYSICALOPACCOUNTLIST'ANDc.column_...
(*) INTO v_col_exists FROM user_tab_cols WHERE column_name = 'EFFECTIVE_DATE' AND table_name = 'MEMBERS'; IF (v_col_exists = 0) THEN EXECUTE IMMEDIATE 'ALTER TABLE members ADD effective_date DATE'; ELSE DBMS_OUTPUT.PUT_LINE('The column effective_date already exists'); END IF; ...
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)...
DROP TABLE IF EXISTS tableName2; create table tableName2 ( ID VARCHAR2(36) not null, constraint PK_tableName2 primary key (ID) ); comment on table tableName2 is '表2'; 2、增量添加字段语句 ALTER TABLE tableName1 DROP IF EXISTS columName1; ALTER TABLE tableName1 ADD (columName1 varc...
--如果不存在,使用快速执行语句添加ADD_TMS列 if (v_column_exists = 0) then execute immediate 'alter table TEST add (ADD_TMS date)'; ELSE dbms_output.put_line('表中已存在要添加的列'); end if; end; --oracle中斜杠(/)的含义斜杠就是让服务器执行前面所写的sql脚本 ...
[SugarColumn(IsPrimaryKey =true)]publiclongId {get;set; }publicstringName {get;set; }//When the sub-table field is inserted, which table will be inserted according to this field.//When it is updated and deleted, it can also be convenient to use this field to//find out the related ...
Oracle增加修改删除字段添加字段的语法:alter table tablename add (column datatype [default value][null/not null],….);修改字段的语法:alter table tablename modify (column datatype [default value][null/not null],….);删除字段的语法:al
accessaddadminadministratoradvisorallalterandanyas ascauditbaseurlbetweenbybytecharcheckclustercolumn commentconnectcompresscreatecurrentdatadatedecimaldefaultdelete descdistinctdoubledropelseexclusiveexistsextendsfalsefile firstfloatforfromgrantgrouphavingIDidentifiedif ...