added and/or operators for Sql data type

core/src/main/scala/zio/jdbc/Sql.scala

@@ -15,6 +15,7 @@
  */
 package zio.jdbc
 
+import zio.jdbc.Sql.intersperse
 import zio.{ Chunk, ChunkBuilder }
 
 /**
@@ -93,7 +94,14 @@ final class Sql[+A](
 
   def withDecode[B](f: ZResultSet => B): Sql[B] =
     Sql(segments, f)
+
+  def and(right: SqlFragment*)(implicit ev: A <:< ZResultSet): SqlFragment =
+    self ++ intersperse(Sql.and, right)
+
+  def or(right: SqlFragment*)(implicit ev: A <:< ZResultSet): SqlFragment =
+    self ++ intersperse(Sql.or, right)
 }
+
 object Sql {
   val empty: SqlFragment = Sql(Chunk.empty, identity(_))
 
@@ -128,4 +136,9 @@ object Sql {
   private[jdbc] val rparen                               = sql""")"""
   private[jdbc] val comma                                = sql""","""
   private[jdbc] val nullLiteral                          = sql"""NULL"""
+  private[jdbc] val and                                  = sql"""AND"""
+  private[jdbc] val or                                   = sql"""OR"""
+  private[jdbc] val not                                  = sql"""NOT"""
+  private[jdbc] val in                                   = sql"""IN"""
+
 }