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SQL 2022-03-21 21:30:58
alter table add column and foreign key mysql
-- On Create CREATE TABLE tableName ( ID INT, SomeEntityID INT, PRIMARY KEY (ID), FOREIGN KEY (SomeEntityID) REFERENCES SomeEntityTable(ID) ON DELETE CASCADE ); -- On Alter, if the column already exists but has no FK ALTER... Add solution -
Python 2022-03-20 02:15:44
python create table postgresql
.wp-block-code { border: 0; padding: 0; } .wp-block-code > div { overflow: auto; } .shcb-language { border: 0; clip: rect(1px, 1px, 1px, 1px); -webkit-clip-path: inset(50%); clip-path: inset(50%); height: 1px; margin: -1px; overflow: hidden... Add solution -
TypeScript 2022-01-28 22:20:27
constraints types
NOT NULL # Ensures a column cannot have a NULL value UNIQUE # Ensures all values in a column are unique PRIMARY KEY # Identifies a record in a table, is NOT NULL & UNIQUE FOREIGN KEY # References a unique record from another table CHECK # Ens... Add solution -
SQL 2022-01-22 02:15:02
drop all tables in azure sql database
while(exists(select 1 from INFORMATION_SCHEMA.TABLE_CONSTRAINTS where CONSTRAINT_TYPE='FOREIGN KEY')) begin declare @sql nvarchar(2000) SELECT TOP 1 @sql=('ALTER TABLE ' + TABLE_SCHEMA + '.[' + TABLE_NAME + '] DROP CONSTRAINT [' + CONSTRAINT_NAME + ']'... Add solution
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