Impossible d'effectuer la requête

Voici la requête :
SELECT tb_description, tb_nom, tb_id, tb_tpl, tb_css, tb_page, tb_detail_access, tb_votes, tb_aff_votes, tb_comments, tb_ext_add, tb_fiche, tb_nbcol, tb_active, tb_sort_date,tb_sort_note,tb_aff_topfiche,tb_aff_topclics, tb_arbo, tb_enrexp, tb_banniere FROM an_tables WHERE tb_id=

Voici le message d'erreur renvoyé par la base de données :
1064 : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /mnt/sites/paris-achat.com/web/annuaire.php on line 78
Fatal error Impossible d'effectuer la requête

Voici la requête :
SELECT inf_id, inf_nom, inf_titre,inf_type, inf_required, inf_tri, inf_search, inf_title FROM an_infos WHERE tb_id=

Voici le message d'erreur renvoyé par la base de données :
1064 : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /mnt/sites/paris-achat.com/web/annuaire.php on line 226
Impossible d'effectuer la requête

Voici la requête :
SELECT enr_id FROM an_enr WHERE tb_id= AND enr_valid="O"

Voici le message d'erreur renvoyé par la base de données :
1064 : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AND enr_valid="O"' at line 1
Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /mnt/sites/paris-achat.com/web/annuaire.php on line 421

Warning: Division by zero in /mnt/sites/paris-achat.com/web/annuaire.php on line 434
- Paris
Impossible d'effectuer la requête

Voici la requête :
SELECT enr_id FROM an_enr WHERE an_enr.tb_id= and enr_valid='O' ORDER BY enr_partner desc , enr_id desc, enr_date DESC LIMIT 0,

Voici le message d'erreur renvoyé par la base de données :
1064 : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'and enr_valid='O' ORDER BY enr_partner desc , enr_id desc, enr_date DESC L' at line 1
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /mnt/sites/paris-achat.com/web/annuaire.php on line 618
Impossible d'effectuer la requête

Voici la requête :
SELECT tb_visites FROM an_stats_table WHERE st_date='2010-03-11' and tb_id=

Voici le message d'erreur renvoyé par la base de données :
1064 : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /mnt/sites/paris-achat.com/web/annuaire.php on line 1220
Impossible d'effectuer la requête

Voici la requête :
INSERT INTO an_stats_table (st_date, tb_id, tb_visites) VALUES ('2010-03-11', , 1)

Voici le message d'erreur renvoyé par la base de données :
1064 : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' 1)' at line 1