SQL Multi-Table Federated update

1. SQLite Multi-Table Update method

UPDATE TA SET col1=tb.col1from tableA ta INNER JOIN tableB TB on Ta.col2=tb.col2

This is a very simple batch update statement in SQL Server that supports this syntax but is not supported in SQLite, which can be converted to the following syntax:

UPDATE TableA SET col1= (SELECT col1 from TableB WHERE col2=tablea.col2)

2. SQL Server Multi-table Update method

UPDATE {table_name with (< table_hint_limited > [... n]) | view_name | rowset_function_limited} SET {Column_na me = {Expression | Default| NULL} | @variable = Expression |  @variable = column = expression} [,... n]{{[from {< Table_source >} [,... n]] [WHERE < search_condition >]} | [WHERE Current of {{[GLOBAL] cursor_name} | cursor_variable_name}]} [OPTION (< query_hint > [,... n])]

SQL Server Example:

UPDATE TA SET ta.col1=tb.col1,ta.col2=tb.col2 from TableA ta,tableb TB WHERE ta.col3=tb.col3

3. Access database Multi-table Update method
x = "Update" + DLTB + "A INNER join TBAREA2 B on A.objectid=b.fid set a." + FD_DLTB_XZDWMJ + "=B.AREA_XZDW, A." + Fd_d LTB_LXDWMJ + "=B.AREA_LXDW";
Sqllist.add (x);

4. Oracle Multi-Table Update method
Oracle Syntax:
UPDATE updatedtable
SET (Col_name1[,col_name2 ...]) = (SELECT col_name1,[,col_name2 ...] From srctable
[WHERE Where_definition])

Oracel Example:
UPDATE Landleveldata A set (A.gqdltks, A.bztks) = (select B.gqdltks,
B.bztks from GDQLPJ b where A.GEO_CODE=B.LXQDM)

5. MySQL Multi-Table Update method
MySQL Syntax:
UPDATE table_references SET col_name1=expr1 [, col_name2=expr2 ...]
[WHERE Where_definition]

MySQL Example:
UPDATE Landleveldata A, GDQLPJ b
SET a.gqdltks= B.gqdltks, A.bztks=b.bztks
WHERE A.GEO_CODE=B.LXQDM

SQL Multi-Table Federated update