SQL clause is the specific part of a SQL statement which is used to perform various operations. It is used to filter, retrieve, group, sort, join and manipulate data.
SQL clause is essential for performing operations in the SQL databases that can be combined to create more complex queries to retrieve and manipulate data.
This clause is used to retrieve/get data from table(s) in the database.
SELECT column_name(s)
FROM table_name;
This clause is used to specify table name(s) from where data will be retrieved.
SELECT column_name(s)
FROM table_name;
This clause specifies condition(s) to filter data in the database.
SELECT column_name(s)
FROM table_name
WHERE conditions;
This clause is used to group and summarize the data based on column(s). It is often combined with aggregate functions such as SUM, AVG, COUNT, MIN and MAX etc. to calculate the summaries of the grouped data.
SELECT column_name(s)
FROM table_name
GROUP BY column_name(s);
This clause is always used with "GROUP BY" clause to filter the data that has already been grouped by the "GROUP BY" clause.
SELECT column_name(s)
FROM table_name
GROUP BY column_name(s)
HAVING conditions;
This clause is used to sort the data in ascending or descending order based on column(s).
SELECT column_name(s)
FROM table_name
ORDER BY column_name(s) ASC;
This clause is used to combine two or more tables data by using a common column.
SELECT column_name(s)
FROM table1
JOIN table2
ON table1.column_name = table2.column_name;
This clause is used to merge the result of multiple SELECT statements into a single result by eliminating duplicates rows.
SELECT column_name(s)
FROM table1
UNION
SELECT column_name(s)
FROM table2;
This clause is same as "UNION Clause", the only difference is that "UNION ALL" does not eliminates duplicate values from the result.
SELECT column_name(s)
FROM table1
UNION ALL
SELECT column_name(s)
FROM table2;
This clause is used to fetch specified number or percentage of rows from a table.
SELECT TOP n column_name(s)
FROM table_name;
OR
SELECT TOP n PERCENT column_name(s)
FROM table_name;
This clause is used to eliminate the duplicate rows from the result.
SELECT DISTINCT column_name(s)
FROM table_name;
Clauses in SQL are segments of a query that define conditions, constraints, or actions, such as SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY.
The HAVING clause in SQL is used with GROUP BY to filter rows based on aggregated values.
There is no specific "some" clause in SQL; it might be a misunderstanding or typo.
The six main clauses of the SELECT statement in SQL are SELECT, FROM, WHERE, GROUP BY, HAVING, and ORDER BY.