The very basic of Sql Select has the following syntax.
The above sql select statement is the Sql statement in its simplest form, it tells which columns to select and from what table you want to get data. Later, you can add more advanced options to the statement that can make it very powerful.
If you need to select all columns from a table, you can use "*" to replace column_list.
To illustrate, let's use the following CONTACTS table that lists your contacts persons:
|1||White||Alan||210 George St||Sydney||NSW||2000|
|2||Johnson||Benjamin||11 Cooper St||Surry Hill||NSW||2010|
|3||Brown||Peter||72 Haymarket St||Haymarket||NSW||2000|
|4||Anderson||Thomas||33 Collins St||Melbourne||VIC||3000|
|5||Gomdas||Tony||78 Marine Pde||Coolangatta||QLD||4225|
If you just want to know the names in your contact, to do this write this sql select:
If you want to list all columns in that Contacts table, you type this sql:
That displays everything in that table.
Wait the minute, you said, I only want to see contacts that live in NSW. What do I do?
To do that you need WHERE clause in the Select statement, which will be discussed next in the Sql Where section.
Eliminating duplicate values in the output.
Conditionally selecting rows from table.
Pattern searching for conditions in Where or Having clause
Added to conditions to show results between two values.
It enables us to specify multiple values, either as a list or a subquery.
Sql And Or
Connecting two or more conditions in the Where or Having clause.
Counting number of rows.
Getting the sum of a field
This function will return the highest value.
This function will return the lowest value.
This function will return the average value.
Sql Order By
Sorting the output
Sql Group By
Grouping rows into sets.
To filter the result of aggregation
Return from Sql Select to Sql Commands
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