Constraint Definition
An expression that defines a table constraint
Grammar syntax
constraint_specification:
: [, PRIMARY KEY (col_name, ...) DISABLE NOVALIDATE RELY/NORELY ]
[, CONSTRAINT constraint_name FOREIGN KEY (col_name, ...) REFERENCES table_name(col_name, ...) DISABLE NOVALIDATE
[, CONSTRAINT constraint_name UNIQUE (col_name, ...) DISABLE NOVALIDATE RELY/NORELY ]
[, CONSTRAINT constraint_name CHECK [check_expression] ENABLE|DISABLE NOVALIDATE RELY/NORELY ]
Sample Source
1. Primary Key Table Constraint
Primary Key is fully supported by Snowflake.
CREATE TABLE table1 (
col1 integer,
PRIMARY KEY (col1) DISABLE NOVALIDATE RELY
);
2. Foreign Key Table Constraint
Foreign Key is fully supported by Snowflake.
CREATE TABLE table1 (
col1 integer,
CONSTRAINT fk_col1 FOREIGN KEY (col1) REFERENCES tbl1(col1) DISABLE NOVALIDATE
);
3. Unique Table Constraint
Foreign Key is fully supported by Snowflake.
CREATE TABLE table1 (
col1 integer,
CONSTRAINT c1_unique UNIQUE(col1) DISABLE NOVALIDATE
);
4. Check Table Constraint
Check constraint is not supported by Snowflake.
Sample Source
CREATE TABLE table1 (
price double,
CONSTRAINT c1_check CHECK (price > 0 AND price <= 1000)
);
Known Issues
No issues were found.
Related EWIs
MSC-HVXXXX : THE CREATE TABLE CHECK CONSTRAINT IS NOT SUPPORTED IN SNOWFLAKE.
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