how to add default constraint in mysql
ALTER TABLE "name_table" ALTER "name_column"
SET DEFAULT value_default;how to add default constraint in mysql
ALTER TABLE "name_table" ALTER "name_column"
SET DEFAULT value_default;adding a default constraint to an existing column in sql
--Altering an existing column to add a default constraint:
ALTER TABLE {TABLE NAME}
ADD CONSTRAINT {CONSTRAINT NAME}
DEFAULT {DEFAULT VALUE} FOR {EXISTING COLUMN NAME}
--Adding a new column, with default value, to an existing table:
ALTER TABLE {TABLE NAME}
ADD {COLUMN NAME} {DATA TYPE} {NULL | NOT NULL}
CONSTRAINT {CONSTRAINT NAME} DEFAULT {DEFAULT VALUE}
--Dropping a contraint:
ALTER TABLE {TABLE NAME}
DROP CONSTRAINT {CONSTRAINT NAME}default constraint in ms sql
/*Alter an existing column to add a default constraint*/
ALTER TABLE (Table_Name)
ADD CONSTRAINT (Constraint_Name)
DEFAULT (Default_Value) FOR (Existing_Column_Name)default constraint in ms sql
/*Adding a New Column, with default value to an existing table*/
ALTER TABLE (Table_Name)
ADD (Column_Name)(Data_Type) (Null/NOT NULL)
CONSTRAINT (Constraint_Name) DEFAULT (Default_Value)Copyright © 2021 Codeinu
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