sql cascade delete sql

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Rayane
02 May 2019
1ALTER TABLE dbo.T2
2   DROP CONSTRAINT FK_T1_T2   -- or whatever it's called
3
4ALTER TABLE dbo.T2
5   ADD CONSTRAINT FK_T1_T2_Cascade
6   FOREIGN KEY (EmployeeID) REFERENCES dbo.T1(EmployeeID) ON DELETE CASCADE
7
source
Ella
05 Feb 2016
1CREATE TABLE child_table
2(
3  column1 datatype [ NULL | NOT NULL ],
4  column2 datatype [ NULL | NOT NULL ],
5  ...
6
7  CONSTRAINT fk_name
8    FOREIGN KEY (child_col1, child_col2, ... child_col_n)
9    REFERENCES parent_table (parent_col1, parent_col2, ... parent_col_n)
10    ON DELETE CASCADE
11    [ ON UPDATE { NO ACTION | CASCADE | SET NULL | SET DEFAULT } ] 
12);
source
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