SQL Script: Copy ALTER TABLE Employee MODIFY (FirstName VARCHAR2(50));The following will change the size in the PostgreSQL database. SQL Script: Copy ALTER TABLE Employee ALTER COLUMN FirstName TYPE VARCHAR(50);Be careful while decreasing the size of a column where the data exist. It will...
sql alter table语句:添加、修改或删除操作 ALTERTABLE语句:用于对已有的表中进行添加、修改或删除操作。 1、修改表名:altertableonetestrenameto test; 2、添加列:altertabletable_nameaddcolumncol_namedatatype; 3、修改列名:altertabletable_namechangeold_namenew_name ...
CREATETABLEIFNOTEXISTS`runoob_alter_test`(`dataType0`varchar(100),`dataType1`bigint,`dataType2`bigint,`dataType3`bigint)ENGINE=InnoDBDEFAULTCHARSET=utf8;##A.ALTERTABLErunoob_alter_testMODIFYdataType1smallint;##B.ALTERTABLErunoob_alter_testMODIFYdataType1smallintNOTNULL;##C.ALTERTABLErunoob_al...
1. 更改表格 alter table table_name add column column_name datatype 说明:增加一个列(没有删除某个栏位的语法。 alter table table_name add primary key (column_name) 说明:把表的一个列名设为主键 alter table table_name drop primary key (column_name) 说明:把主键的定义删除。 alter table student...
CreateCustomEntityType CreateDatabase CreateDataQualityRuleset CreateDevEndpoint CreateIntegration CreateIntegrationResourceProperty CreateIntegrationTableProperties CreateJob CreateMLTransform CreatePartition CreatePartitionIndex CreateRegistry CreateSchema CreateScript CreateSecurityConfiguration CreateSession CreateTable Create...
SqlServer.TransactSql.ScriptDom AbortAfterWaitType AcceleratedDatabaseRecoveryDatabaseOption AddAlterFullTextIndexAction AddFileSpec AddMemberAlterRoleAction AddSearchPropertyListAction AddSensitivityClassificationStatement AddSignatureStatement AdHocDataSource AdHocTableReference AffinityKind AlgorithmKeyOption Allow...
AddLiveDataSource AddLocalServer AddManifest AddMember AddMemberFormula AddMethod AddModule AddNamespace AddNestedTable AddNoColor AddOnlineVersion AddOrRemoveColumns AddPageGuides AddParameter AddParentNode AddPhone AddProperty AddQuery AddReference AddRelationship AddRemoteServer AddressEditor AddRightFrame Add...
CREATE TABLE SCHEMA_NAME.TABLE_NAME ( COLUMN1 datatype [ NULL | NOT NULL ] PRIMARY KEY, COLUMN2 datatype [ NULL | NOT NULL ], ... ); Let’s create a table namedEmployeesin theHumanResourcesschema for testing purposes with the below script: ...
ALTER TABLE customer MODIFY ( 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...
ALTER TABLE customer MODIFY ( cust_name varchar2(100) not null, cust_hair_color varchar2(20) ) ; 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)';...