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Foreign key constraints
Actions Constraint properties Column Creating a foreign key over a non-indexed column would automatically create an index on it. Alternatively, you can define an index below, before creating the foreign key. Foreign key constraint (INNODB)
Database Table Column
ON DELETE ON UPDATE
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Internal relationships Documentation
Column Internal relation An internal relation is not necessary when a corresponding FOREIGN KEY relation exists.
id
barcode
d0
d1
d2
d3
d4
d5
d6
d7
d8
d9
m0
m1
m2
m3
m4
m5
m6
m7
m8
m9
y0
y1
y2
y3
y4
y5
y6
y7
y8
y9
sid
p1
p2
p3
p4
p5
p6
p7
p8
p9