SQLForeignKey

See Also

Clause Expressions

• struct SQLAlterColumnDefinitionType
  A clause specifying a new data type to be applied to an existing column.
• struct SQLColumnAssignment
  Encapsulates a column_name=value expression in the context of an UPDATE query’s value assignment list. This is distinct from an SQLBinaryExpression using the .equal operator in that the left side must be an unqualified column name, the operator must be =, and the right side may use SQLExcludedColumn when the assignment appears in the assignments list of a SQLConflictAction.update(assignments:predicate:) specification.
• enum SQLColumnConstraintAlgorithm
  Column-level data constraints.
• struct SQLColumnDefinition
  A clause expressing a column definition, for use when creating and altering tables.
• struct SQLCommonTableExpression
  A clause describing a single Common Table Expressions, which in itws simplest form provides additional data to a primary query in the same way as joining to a subquery.
• struct SQLCommonTableExpressionGroup
  A clause representing a group of one or more SQLCommonTableExpressions.
• enum SQLConflictAction
  An action to take when an INSERT query encounters a unique constraint violation.
• struct SQLConflictResolutionStrategy
  Specifies a conflict resolution strategy and associated conditions for an INSERT query. An INSERT with a conflict strategy is often refered to as an UPSERT (“insert or update”). Databases are not required to support any given subset of upsert functionality, or any at all.
• enum SQLDropBehavior
  Specifies a behavior when performing a DROP operation on a database object which is referenced by other objects.
• struct SQLEnumDataType
  Represents a data type which specifies an enumeration in the database.
• struct SQLExcludedColumn
  An expression appearing on the right side of a column assignment which, when the assignment list is part of an upsert’s update acion, refers to the value which was originally to be inserted for the given column.
• struct SQLInsertModifier
  Simple helper for working around MySQL’s refusal to implement standard SQL. Only emits SQL when needed.
• struct SQLJoin
  Encapsulates a single SQL JOIN, specifying the join type, the right-side table, and condition.
• enum SQLJoinMethod
  The method used by a table join clause.
• enum SQLLockingClause
  An SQL locking clause.