1. Create a database
create database databaseName
user databaseName
go / * Go to the specified database * /
2, create a table
create table tableName(
/*
Field name
*/
)
3, insert data
insert into tableName values ( '', '', '', '', '', ',',); / * there is a need to insert bracket data * /
4, create a primary key
alter table tableName add constra py_tableNameId primary key (tableNameId) / * py_tableNameId: Name; tableNameId: primary key name to be set * /
5, the foreign key added
alter table tableNameA add constra py_tableNameId foreign key (tableNameAId) references tableNameB (tableNameBId) / * py_tableNameId: Name; tableNameAId: foreign keys to be set, tableNameBId: field name associated with the need * /
6: Modifying Data
update tableName set Field name = '' WHERE condition (field = '')
7: Query Data
select * from tableName / * query all the data * /
select * from tableName where conditions / * condition query all fields * /
select top 10 from tableName / * look-up table 10 before the data or query by the conditions of the first 10 data * /
select top 10 from tableName where the condition / * query by the conditions of the first 10 data * /
select distinct field names from tableName "; // queries do not duplicate data
8, delete data
delete from tableName where conditions / * Delete Row * /
delete from tableName / * Delete all rows * /
drop tableName / * Delete table * /
9, plus add fields:
the ALTER the Table tableName the Add Column Name varchar (20) 10, delete the field
alter
table
tableNamedrop
column
字段名;