{"id":3009,"date":"2021-07-21T12:09:10","date_gmt":"2021-07-21T12:09:10","guid":{"rendered":"https:\/\/www.bearloga.space\/?page_id=3009"},"modified":"2021-07-21T12:09:10","modified_gmt":"2021-07-21T12:09:10","slug":"postgresql-znacheniya-null","status":"publish","type":"page","link":"https:\/\/www.bearloga.space\/en\/postgresql-znacheniya-null\/","title":{"rendered":"PostgreSQL \u2014 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f NULL"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">PostgreSQL&nbsp;<strong>NULL<\/strong>&nbsp;\u2014 \u044d\u0442\u043e \u0442\u0435\u0440\u043c\u0438\u043d, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0439 \u0434\u043b\u044f \u043e\u0431\u043e\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u043f\u0443\u0449\u0435\u043d\u043d\u043e\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f.&nbsp;\u0417\u043d\u0430\u0447\u0435\u043d\u0438\u0435 NULL \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u0435 \u2014 \u044d\u0442\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0432 \u043f\u043e\u043b\u0435, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u043a\u0430\u0436\u0435\u0442\u0441\u044f \u043f\u0443\u0441\u0442\u044b\u043c.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u043e\u043b\u0435 \u0441\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435\u043c NULL \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u043b\u0435\u043c \u0431\u0435\u0437 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f.&nbsp;\u041e\u0447\u0435\u043d\u044c \u0432\u0430\u0436\u043d\u043e \u043f\u043e\u043d\u0438\u043c\u0430\u0442\u044c, \u0447\u0442\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 NULL \u043e\u0442\u043b\u0438\u0447\u0430\u0435\u0442\u0441\u044f \u043e\u0442 \u043d\u0443\u043b\u0435\u0432\u043e\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0438\u043b\u0438 \u043f\u043e\u043b\u044f, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u0442 \u043f\u0440\u043e\u0431\u0435\u043b\u044b.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0421\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u041e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 \u0441\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f&nbsp;<strong>NULL<\/strong>&nbsp;\u043f\u0440\u0438 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0438 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">CREATE TABLE COMPANY(\n   ID INT PRIMARY KEY     NOT NULL,\n   NAME           TEXT    NOT NULL,\n   AGE            INT     NOT NULL,\n   ADDRESS        CHAR(50),\n   SALARY         REAL\n);\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0417\u0434\u0435\u0441\u044c&nbsp;<strong>NOT NULL<\/strong>&nbsp;\u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442, \u0447\u0442\u043e \u0441\u0442\u043e\u043b\u0431\u0435\u0446 \u0432\u0441\u0435\u0433\u0434\u0430 \u0434\u043e\u043b\u0436\u0435\u043d \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0442\u044c \u044f\u0432\u043d\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0434\u0430\u043d\u043d\u043e\u0433\u043e \u0442\u0438\u043f\u0430 \u0434\u0430\u043d\u043d\u044b\u0445.&nbsp;\u0415\u0441\u0442\u044c \u0434\u0432\u0430 \u0441\u0442\u043e\u043b\u0431\u0446\u0430, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043c\u044b \u043d\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b\u0438 NOT NULL.&nbsp;\u0421\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e, \u044d\u0442\u043e \u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442, \u0447\u0442\u043e \u044d\u0442\u0438 \u0441\u0442\u043e\u043b\u0431\u0446\u044b \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c NULL.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u043e\u043b\u0435 \u0441\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435\u043c NULL \u2014 \u044d\u0442\u043e \u043f\u043e\u043b\u0435, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0431\u044b\u043b\u043e \u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043e \u043f\u0443\u0441\u0442\u044b\u043c \u043f\u0440\u0438 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0438 \u0437\u0430\u043f\u0438\u0441\u0438.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u043f\u0440\u0438\u043c\u0435\u0440<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0417\u043d\u0430\u0447\u0435\u043d\u0438\u0435 NULL \u043c\u043e\u0436\u0435\u0442 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043f\u0440\u0438 \u0432\u044b\u0431\u043e\u0440\u0435 \u0434\u0430\u043d\u043d\u044b\u0445, \u043f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 \u043f\u0440\u0438 \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0438 \u043d\u0435\u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0441 \u043b\u044e\u0431\u044b\u043c \u0434\u0440\u0443\u0433\u0438\u043c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435\u043c \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0432\u0441\u0435\u0433\u0434\u0430 \u043d\u0435\u0438\u0437\u0432\u0435\u0441\u0442\u0435\u043d \u0438 \u043d\u0435 \u0432\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f \u0432 \u043e\u043a\u043e\u043d\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b.&nbsp;\u0420\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0443\u044e \u0442\u0430\u0431\u043b\u0438\u0446\u0443,&nbsp;<a href=\"https:\/\/www.tutorialspoint.com\/postgresql\/company.sql\" target=\"_blank\" rel=\"noreferrer noopener\">\u041a\u041e\u041c\u041f\u0410\u041d\u0418\u042f,<\/a>&nbsp;\u0438\u043c\u0435\u044e\u0449\u0430\u044f \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0435 \u0437\u0430\u043f\u0438\u0441\u0438 \u2014<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">ID          NAME        AGE         ADDRESS     SALARY\n----------  ----------  ----------  ----------  ----------\n1           Paul        32          California  20000.0\n2           Allen       25          Texas       15000.0\n3           Teddy       23          Norway      20000.0\n4           Mark        25          Rich-Mond   65000.0\n5           David       27          Texas       85000.0\n6           Kim         22          South-Hall  45000.0\n7           James       24          Houston     10000.0<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u0430\u0432\u0430\u0439\u0442\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 UPDATE, \u0447\u0442\u043e\u0431\u044b \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 NULL \u0432 NULL \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">testdb=# UPDATE COMPANY SET ADDRESS = NULL, SALARY = NULL where ID IN(6,7);<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0422\u0435\u043f\u0435\u0440\u044c \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u0435 COMPANY \u0434\u043e\u043b\u0436\u043d\u044b \u0431\u044b\u0442\u044c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0435 \u0437\u0430\u043f\u0438\u0441\u0438:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"> id | name  | age | address     | salary\n----+-------+-----+-------------+--------\n  1 | Paul  |  32 | California  |  20000\n  2 | Allen |  25 | Texas       |  15000\n  3 | Teddy |  23 | Norway      |  20000\n  4 | Mark  |  25 | Rich-Mond   |  65000\n  5 | David |  27 | Texas       |  85000\n  6 | Kim   |  22 |             |\n  7 | James |  24 |             |\n(7 rows)<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u0430\u043b\u0435\u0435, \u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u0430&nbsp;<strong>IS NOT NULL<\/strong>&nbsp;\u0434\u043b\u044f&nbsp;<strong>\u0432\u044b\u0432\u043e\u0434\u0430<\/strong>&nbsp;\u0441\u043f\u0438\u0441\u043a\u0430 \u0432\u0441\u0435\u0445 \u0437\u0430\u043f\u0438\u0441\u0435\u0439, \u0433\u0434\u0435 SALARY \u043d\u0435 \u0440\u0430\u0432\u0435\u043d NULL \u2014<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">testdb=#  SELECT  ID, NAME, AGE, ADDRESS, SALARY\n   FROM COMPANY\n   WHERE SALARY IS NOT NULL;<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u0440\u0438\u0432\u0435\u0434\u0435\u043d\u043d\u044b\u0439 \u0432\u044b\u0448\u0435 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 PostgreSQL \u0434\u0430\u0441\u0442 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"> id | name  | age | address    | salary\n----+-------+-----+------------+--------\n  1 | Paul  |  32 | California |  20000\n  2 | Allen |  25 | Texas      |  15000\n  3 | Teddy |  23 | Norway     |  20000\n  4 | Mark  |  25 | Rich-Mond  |  65000\n  5 | David |  27 | Texas      |  85000\n(5 rows)\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u0438\u0436\u0435 \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u0430&nbsp;<strong>IS NULL,<\/strong>&nbsp;\u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u0435\u0440\u0435\u0447\u0438\u0441\u043b\u0438\u0442 \u0432\u0441\u0435 \u0437\u0430\u043f\u0438\u0441\u0438, \u0433\u0434\u0435 SALARY \u0440\u0430\u0432\u0435\u043d NULL.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">testdb=#  SELECT  ID, NAME, AGE, ADDRESS, SALARY\n        FROM COMPANY\n        WHERE SALARY IS NULL;<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL&nbsp;NULL&nbsp;\u2014 \u044d\u0442\u043e \u0442\u0435\u0440\u043c\u0438\u043d, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0439 \u0434\u043b\u044f \u043e\u0431\u043e\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u043f\u0443\u0449\u0435\u043d\u043d\u043e\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f.&nbsp;\u0417\u043d\u0430\u0447\u0435\u043d\u0438\u0435 NULL \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u0435 \u2014 \u044d\u0442\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0432 \u043f\u043e\u043b\u0435, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u043a\u0430\u0436\u0435\u0442\u0441\u044f \u043f\u0443\u0441\u0442\u044b\u043c. \u041f\u043e\u043b\u0435 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[104],"tags":[],"class_list":["post-3009","page","type-page","status-publish","hentry","category-postgresql"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/pages\/3009","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/comments?post=3009"}],"version-history":[{"count":0,"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/pages\/3009\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/media?parent=3009"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/categories?post=3009"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/tags?post=3009"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}