Commonly used SQL statements Daquan 2

Catalog

Create tableCreate primary key constraintsInsert dataDelete dataModify tableView database encoding formatCreate sequenceAdd primary keyGet table and column commentModify column nameAdd column Delete column

Create table



create table CAPITAL_ADJUST

(

  CAPITAL_ID VARCHAR2(10),

  CAPITAL_NAME VARCHAR2(50),

  TYPE VARCHAR2(10),

  BELONG VARCHAR2(50),

  IN_DEP VARCHAR2(50),

  ID VARCHAR2(10) not null,

  IN_DEP_LEADER VARCHAR2(50),

  OUT_DEP_LEAD VARCHAR2(50)

)

Add a comment to the column



comment on column CAPITAL_ADJUST.CAPITAL_ID is ' Asset number';

create primary key constraint



alter table CAPITAL_ADJUST add constraint PK_CAPITAL primary key (ID);

insert data



INSERT INTO CAPITAL_ADJUST

  (ID,

   CAPITAL_ID,

   CAPITAL_NAME,

   TYPE,

   BELONG,

   IN_DEP,

   IN_DEP_LEADER,

   OUT_DEP_LEAD)

VALUES

  (1, '001', 'Computer', 'V001', 'Department 1', 'Department 2', 'Transfer person in charge', 'Transfer out Person in charge');

delete data



DELE http://www.cppentry.com Programming Development Programmer Getting Started TE FROM CAPITAL_ADJUST T WHERE T.ID = 1;

Modify table



ALTER TABLE CAPITAL_ADJUST DROP COLUMN OUT_DEP_LEAD;

View database encoding format



select userenv(' language') from dual;

create sequence



create sequence WLXX_JBXX

start with 1

increment by 1

minvalue 1

nomaxvalue

nocycle

nocache

noorder;

increase primary key



alter table WL_B_WLGSGLY

add constraint PK_WL_B_WLGSGLY

primary key(pzid);

get table and column comments



select * from user_col_comments cc where cc.table_name='SYS_B_YWXT';

modify column name



AlTER TABLE GJ_B_FL RENAME COLUMN classification ID TO FLID

select * from USER_TAB_COMMENTS t where t .co='SYS_B_YWXT'Add

column



alter table Tablename add(column1 varchar2(20),column2 number(7,2)...)

Delete column



alter table JJXM_ZLJD_B_CJDW drop column XCDB