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For example
SELECT * FROM movies WHERE director=*
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The asterisk or star symbol ( * ) means all columns. The semi-colon ( ; ) terminates the statement like a period in sentence or question mark in a question.
SELECT * return more data than required to the client which in turn will use more network bandwidth. This increase in network bandwidth also means that data will take a longer time to reach the client application which could be SSMS or your Java application server.
The SQL WHERE Clause The WHERE clause is used to filter records.
The second part of a SQL query is the name of the column you want to retrieve for each record you are getting. You can obviously retrieve multiple columns for each record, and (only if you want to retrieve all the columns) you can replace the list of them with * , which means "all columns".
No, you would need to use the LIKE operator and the % wildcard:
SELECT * FROM movies WHERE director like '%';
You can use LIKE;
SELECT * FROM movies WHERE director LIKE '%' --all
SELECT * FROM movies WHERE director LIKE 'john landis' --exact
SELECT * FROM movies WHERE director LIKE 'steve%berg' --with wildcard
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