LEFT JOIN 語法 (SQL LEFT JOIN Syntax) SELECTtable_column1, table_column2...FROMtable_name1LEFTJOINtable_name2ONtable_name1.column_name=table_name2.column_name; 有些資料庫的語法會是 LEFT OUTER JOIN。 LEFT JOIN 查詢用法 (Example) 這是一個客戶資料表 customers: 而這是產品訂單的資料表 orders...
SQL LEFT JOIN, also known as a LEFT OUTER JOIN, is a type of SQL JOIN operation that retrieves all records from the left table (table1) and the matching records from the right table (table2). If there are no matching records in the right table, NULL values are included for those co...
SQL OUTER JOIN – full outer join The syntax of the SQL full outer join is as follows: SELECTcolumn1, column2...FROMtable_AFULLOUTERJOINtable_BONjoin_conditionWHERErow_conditionCode language:SQL (Structured Query Language)(sql) SQL full outer join returns: ...
RIGHT JOIN works analogously to LEFT JOIN. To keep code portable across databases, it is recommended that you use LEFT JOIN instead of RIGHT JOIN. # The { OJ ... LEFT OUTER JOIN ...} syntax shown in the join syntax description exists only for compatibility with ODBC. The curly braces i...
SELECT*FROMAJOINBONA.X=B.Y Here's a list of equivalent syntaxes: ALEFTJOINB ALEFTOUTERJOINB ARIGHTJOINB ARIGHTOUTERJOINB AFULLJOINB AFULLOUTERJOINB AINNERJOINB AJOINB Also take a look at the answer I left on this other SO question:SQL left join vs multiple tables on FROM line?
mysql> select * from tab_01 full outer join tab_02 on tab_01.name = tab_02.name; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'outer join tab_02 on tab_01.name = tab...
$sql = "SELECT booking.id, booking.username, booking.contact_name FROM booking LEFT OUTER JOIN rbs_room_allocation USING id WHERE (rbs_room_allocation.id IS NULL) AND (booking.trip_id = :trip_id) AND (booking.paid = booking.total)"; $params = array('trip_id' => $trip_id); $resu...
Syntax of LOJ Copy loj_from_clause ::= FROM ( aliased_table_name | left_outer_join_tables left_outer_join_table ::= LEFT OUTER JOIN single_from_table ON expression left_outer_join_tables ::= single_from_table left_outer_join_table (left_outer_join_table)* Semantics The FROM clause sp...
There is no difference, they are absolutely 100% identical in function - the OUTER keyword is optional in the syntax. Personally I prefer LEFT OUTER JOIN as it's a bit more explicit. You can see more details here: MSDN : Using Outer Joins and here: MSDN : FROM (Transact-SQL) The rel...
outer join syntax: 1)you use an outer join to also see rows that do not meet the join condition 2)the outer join operator is the plus sign(+) outer join restrictions: 1)the outer join operator can appear on only one side of the expression:the side that has information missing.it retu...