SELECT clauses

The
SELECT
 statement supports the
ALL
 and
DISTINCT
 set quantifiers. You cannot use
CASE
 and
WHEN
 expressions.
  • FROM
    TIP:
    You can use subqueries for the
    FROM
     and for the
    IN
     predicate.
    The
    FROM
     clause is required, other clauses are optional.
    The clauses must have the following order:
    FROM
    ,
    WHERE
    ,
    GROUP
    ,
    HAVING
    ,
    ORDER
    ,
    LIMIT
    .
  • JOIN
  • AS
    TIP: Aliases for tables and columns support regular and delimited identifiers.
  • WHERE
  • GROUP BY
  • ORDER BY
  • Set function, including:
    COUNT
    ,
    MAX
    ,
    MIN
    ,
    AVG
    , and
    SUM
    .
  • HAVING
  • LIMIT
    TIP:
    Use the
    LIMIT OFFSET
     variant to limit the number of records. The offset is optional and its default value is
    0
    .
    For example,
    SELECT * FROM Table1 LIMIT 1000 OFFSET 10
     returns 1000 records starting from the record number 10.

Examples

The following are examples of
SELECT
 clauses: 
SELECT *, FROM Table1
SELECT *, Timestamp AS T FROM Table1
SELECT Column1 FROM Table1
SELECT *, 10 FROM Table1
SELECT 10, * FROM Table1
SELECT *, 'text value' FROM Table1
SELECT COUNT(*) FROM Table1
SELECT DISTINCT Column1 FROM Table1
SELECT Variable1 AS Label, AVG(Variable1) AS Value FROM Datalogger1 AS A 
    UNION JOIN (SELECT Variable2 AS Label, AVG(Variable2) AS Value FROM Datalogger1 ORDER BY Label ASC) AS B
    ON A.Label = B.Label AND A.Value = B.Value
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