As well as showing the whole Database, PHP can be used to select individual records or records which match certain criteria. To do this you must use a variation of the SELECT query. To display the whole table you used the query:
SELECT * FROM tablename
If we just want to select records which have value=1 in the field1-name row we would use the following query:
SELECT * FROM tablename WHERE field1-name='1'
In the same way, you could select records based on any field in the database. You can also search in more fields by adding more:
field='value'
sections into the query.
For further reference, you can visit the official websites of PHP and MySQL.
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