SQL 快速参考

SQL 快速参考SQL 语句语法AND / ORSELECT column_name(s)FROM table_nameWHERE conditionAND|OR conditionALTER TABLEALTER TABLE table_name ADD column_name datatypeorALTER TABLE table_name DROP COLUMN column_nameAS (alias)SELECT column_name AS column_aliasFROM table_nameorSELECT column_nameFROM table_name AS table_aliasBETWEENSELECT column_name(s)FROM table_nameWHERE column_nameBETWEEN value1 AND value2CREATE DATABASECREATE DATABASE database_nameCREATE TABLECREATE TABLE table_name(column_name1 data_type,column_name2 data_type,column_name2 data_type,...)CREATE INDEXCREATE INDEX index_nameON table_name (column_name)orCREATE UNIQUE INDEX index_nameON table_name (column_name)CREATE VIEWCREATE VIEW view_name ASSELECT column_name(s)FROM table_nameWHERE conditionDELETEDELETE FROM table_nameWHERE some_column=some_valueorDELETE FROM table_name (Note:





Deletes the entire table!!)DELETE * FROM table_name (Note:





Deletes the entire table!!)DROP DATABASEDROP DATABASE database_nameDROP INDEXDROP INDEX table_name.index_name (SQLServer)DROP INDEX index_name ON table_name (MS Access)DROP INDEX index_name (DB2/Oracle)ALTER TABLE table_nameDROP INDEX index_name (MySQL)DROP TABLEDROP TABLE table_nameGROUP BYSELECT column_name,aggregate_function(column_name)FROM table_nameWHERE column_name operator valueGROUP BY column_nameHAVINGSELECT column_name,aggregate_function(column_name)FROM table_nameWHERE column_name operator valueGROUP BY column_nameHAVING aggregate_function(column_name) operator valueINSELECT column_name(s)FROM table_nameWHERE column_nameIN (value1,value2,..)INSERT INTOINSERT INTO table_nameVALUES (value1, value2, value3,....)orINSERT INTO table_name(column1, column2, column3,...)VALUES (value1, value2, value3,....)INNER JOINSELECT column_name(s)FROM table_name1INNER JOIN table_name2 ON table_name1.column_name=table_name2.column_nameLEFT JOINSELECT column_name(s)FROM table_name1LEFT JOIN table_name2 ON table_name1.column_name=table_name2.column_nameRIGHT JOINSELECT column_name(s)FROM table_name1RIGHT JOIN table_name2 ON table_name1.column_name=table_name2.column_nameFULL JOINSELECT column_name(s)FROM table_name1FULL JOIN table_name2 ON table_name1.column_name=table_name2.column_nameLIKESELECT column_name(s)FROM table_nameWHERE column_nameLIKE patternORDER BYSELECT column_name(s)FROM table_nameORDER BY column_name [ASC|DESC]SELECTSELECT column_name(s)FROM table_nameSELECT *SELECT *FROM table_nameSELECT DISTINCTSELECT DISTINCT column_name(s)FROM table_nameSELECT INTOSELECT *INTO new_table_name [IN externaldatabase]FROM old_table_nameorSELECT column_name(s)INTO new_table_name [IN externaldatabase]FROM old_table_nameSELECT TOPSELECT TOP number|percent column_name(s)FROM table_nameTRUNCATE TABLETRUNCATE TABLE table_nameUNIONSELECT column_name(s) FROM table_name1UNIONSELECT column_name(s) FROM table_name2UNION ALLSELECT column_name(s) FROM table_name1UNION ALLSELECT column_name(s) FROM table_name2UPDATEUPDATE table_nameSET column1=value, column2=value,...WHERE some_column=some_valueWHERESELECT column_name(s)FROM table_nameWHERE column_name operator value