Bi-sql delete

DELETE sentence

DELETE This word is sure to be familiar to my friends , It's on our keyboard Delete Key .

stay SQL in ,DELETE Statement can be used to delete rows in a table .

Basic grammar

grammar 1：

DELETE FROM  The name of the table  WHERE  Column name  =  Conditional value 

grammar 2：

DELETE FROM  The name of the table 

grammar 3：

DELETE * FROM  The name of the table 

Using examples

Case data ：

In the database of white tea machine , There is a name “TEST” The database of , There is a name “ Product list ” Case data for .

Example 1：

stay PowerBI Delete in [ Product list ] in [ Name of commodity ] by “ White tea ” The data of .

DELETE FROM  Product list  WHERE  Name of commodity  = N' White tea '

give the result as follows ：

You can see ,[ Name of commodity ] by “ White tea ” The data of has been deleted .

Example 2：

Delete all data in the product table .

DELETE FROM  Product list 

give the result as follows ：

You can see , The data in the product table has been cleared , The table structure is preserved .

Have a chat ：

Remember at the beginning , White tea just touched PowerBI, Want to get the data of the warehouse , at that time DBA He asked ,PowerBI Whether the data warehouse will be backfilled .

White tea answered the righteous words at that time ： Can't ！

But through these issues SQL The basic study of , What I said at that time was really a layman .

So here , White tea has some tips to share with you ：

• If you didn't IT background , So when others ask about some technology , Never give a random answer

• Nothing is 100% certain , Don't talk like white tea

• PowerBI There are many connectors , If the account authority is too large , Be sure to make sure that PowerBI Whether the operation will affect the data source

• If you are familiar with the connector used , Then you can go to PowerBI Execute the reverse write of log warehouse in , On the contrary, it should be handled carefully

This is white tea , One PowerBI Beginners .