DDL:
CREATE TABLE tablename(A1 D1,...An Dn,PRIMARY KEY(Ai))
INSET INTO tablename(attrlist) VALUSE(valuelist)
DELETE FROM tablename
DROP TABLE tablename
ALTER TABLE tablename ADD A D ALTER TABLE tablename DROP A
DML:
SELECT DISTINCT Alist FROM tablenames WHERE P
SELECT attr AS attrNew FROM tablenames WHERE P
SELECT attrs FROM tablename as Var WHERE P
WHERE attr OP constant OP:and,or,not,<,<=,>,>=,=,<>,between,not between
FROM
oldName AS newName
WHERE attr LIKE str % match any string,_ match a char
ORDER BY attr ASC|DESC
set operation: UNION,INTERSECT,EXCEPT
gather function: AVG,SUM,MAX,MIN,COUNT
WHERE ... GROUP BY ... HAVAING ...
about NULL: IS NOT NULL ,IS UNKNOWN ,IS NOT UNKNOWN
WHERE attr in|not in OP
set comparing: OP SOME|ALL OP: AS BEFORE
EXIST NOT EXIST UNIQUE NOT UNIQUE
CREATE VIEW view AS operations WITH CHECK OPTION
DELETE FROM tablename WHERE P
UPDATE tablename SET ... WHERE ...
CASE
link relation: INNER JOIN ,LEFT OUTER JOIN ,RIGHT OUT JOIN ,NATURAL INNER JOIN ,CROSS JOIN , UNION JOIN
SQL
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